The Ultimate Guide to HTML for Beginners: How to Write, Learn & Use It

Learn what HTML is and how to write it. Then learn its most common elements and attributes.

Written by: Anna Fitzgerald


Basic definitions, differences, and codes to know for your website.

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html being written by developer on a desktop computer



HTML is the foundation of most web pages — it’s how we tell browsers to structure content into titles, headings, paragraphs, images, links, lists, forms, tables, and more.

In this guide to HTML for beginners, we’ll learn what HTML is and what it’s used for. Then, we’ll walk through how to write HTML and review some of the most common elements and attributes in the language. Finally, we’ll end with a brief look at some resources you can use to continue learning and using HTML.

Let’s get started.

Download Now: 25 Free HTML & CSS Hacks

First published by Tim Berners-Lee in 1989, HTML is now used by 94% of all websites, and probably all the ones you visit. But what is it exactly?

Check out this short video for a quick definition of HTML, then we'll dive deeper:

As mentioned above, HTML is an acronym for “Hypertext Markup Language.” Let’s break this down word-by-word to better understand what HTML actually means.

“Hypertext” is text that contains references to other text or pages, also known as hyperlinks. Hyperlinks allow you to go anywhere on the web with a click of the mouse. Rather than reading a web page in the linear order that the author laid out, like in print, we can use hyperlinks to jump to another section of the same page, a different page on the current website, or to a completely new website. For example, here’s a hyperlink that sends readers back to the top of this blog post. Hyperlinks can also open a PDF, email, or multimedia, like a video or audio file.

Linking information together in this way revolutionized the web. Together, HTML and the internet make it possible for anyone to access all types of information around the world, in any order they want.

“Markup” refers to how HTML “marks up” the page with annotations within the HTML file. These annotations are not displayed on the web page itself — they work behind-the scenes telling browsers how to display the document to visitors. We'll learn more about this markup soon.

“Language” is the simplest part of the acronym to understand. Like any language, HTML is made up of a unique syntax and alphabet. But what kind of language is it, exactly? Let’s tackle this question below.

Is HTML a programming language?

Whether HTML is or is not technically a programming language is an ongoing debate among web developers and experts. Look how divided this one SERP is on the subject:

SERP showing articles with headlines saying HTML is not a programming language and that HTML is

While the majority defines HTML as a markup language, not a programming language, some argue the two aren’t mutually exclusive.

To understand this distinction, we have to know the definition of a programming language. All programming languages have some functional purpose — they need to “do” something, whether it be evaluating expressions, declaring variables, or modifying data. These languages not only instruct computers what to do, but how to do it. JavaScript is the most widely-used programming language in web development. Other popular programming languages include Python, Java, and C/C++.

HTML, on the other hand, doesn’t really “do” anything. It simply gives browsers the content it needs to display. HTML doesn’t care how the browser goes about displaying the content, as long as it’s displayed. In other words, HTML has a structural purpose, not a functional one.

Still, some developers use this same logic to argue that HTML is a programming language — it’s just a declarative programming language. According to Professor David Brailsford from the University of Nottingham, for example, declarative languages are much more restricted than other languages because they ask for something and don’t care how it happens, but that doesn’t make them any less of a programming language. You can check out his full argument in this video.

While this is an interesting and rich point of discussion, it probably won’t affect how you code in HTML. With that in mind, let’s move on to what HTML is used for.

What is HTML used for?

HTML is primarily used for creating web pages. Because it’s open-source and supported by all modern browsers, HTML is free to use and ensures your text, images, and other elements are displayed intended. Without HTML, all web pages would be plain text files that looked like this:

a plain text file full of dummy textWith HTML, not only can you format documents with headings, paragraphs, lists, and other elements — you can also embed images, videos, audio files, and other multimedia via hyperlinks. And, you can link to other web pages on the same website or from another site. This allows visitors to easily navigate your website and jump between websites stored on different web servers.

Even after adding headings, images, and hyperlinks, you’d still have a very basic web page — and that’s by design. HTML is supposed to create a simple base upon which Cascading Style Sheets (CSS) and JavaScript (JS) can be added. With CSS, you can customize your styling and layouts, changing the color, font, and alignment of elements. With and JS, you can add dynamic functionality like pop-ups and photo sliders.

HTML is used to create things other than web pages, too. You can use it to:

Whether you want to create web pages, tables, forms, or emails, you'll need to know how to write HTML. Let’s break down the process below.

How to Write HTML

As mentioned, HTML is just plain text annotated with markup. More precisely, this markup consists of tags and attributes. To help you visualize this syntax, here’s a graphic:

HTML Element diagram

Let's take a closer look at each component of an HTML element below.


HTML elements are designated by tags. Most elements have an opening and closing tag. Opening tags precede the text and contain the element name enclosed by the brackets “<” and “>”. Closing tags are identical to opening tags, save for a backward slash that precedes the element name.

Say you want to add a paragraph to your web page, and the text of the paragraph is “This is a paragraph.” You’ll wrap it with the HTML paragraph tags: <p></p>. So, the HTML will look like this:


<p>This is a paragraph.</p>

Together, these three things are all you need make a paragraph element in HTML.

Most HTML elements are the same: an opening tag, a closing tag, and content in between. Some HTML elements, such as <br> (break), only have an opening tag — these are called empty tags.

Element names are case-insensitive. Meaning, they can be written in uppercase, lowercase, or some combination of the two. For example, the <p> tag can also be written as <P>. However, it is considered a best practice to always write the name in lowercase.

HTML Attributes

While all HTML elements need tags, only some need attributes. An attribute provides additional information about the HTML element, and this information can be essential or non-essential.

For example, an image element must always have a source attribute whose value is the image URL or file path. Otherwise, the browser will not know what image to render. The same goes for the anchor element, which is used to create hyperlinks — it must contain an href attribute whose value specifies the link’s destination. Otherwise, if a visitor clicks on the anchor element, the browser won’t send them anywhere.

Other attributes aren’t essential to include but are considered a good practice. For example, a browser can render an image without the alt attribute, which contains image alt text. But, a reader with visual impairments might have trouble understanding what the image conveys without an alternative text description.

Now that we understand the importance of attributes, let’s make sure we understand how to find and write them. An attribute is always found in the opening tag of an HTML element and has the syntax: name=”value”.

Many elements have their own set of attributes that affect how the content is rendered on the page. Attributes can be written in any order inside the opening tag. However, you cannot put multiple instances of the same attribute inside the same HTML tag.

Before we walk through how to create an HTML file, let's look at what tools you'll need. 

How to Use HTML

To start using HTML, you need a text editor like Notepad++ or SublimeText. Since an HTML file is in standard text format, any basic text editor will work. But for the sake of this demo and since SublimeText works for Mac and Windows, we’ll walk through the process using this editor.

Step 1: Download the latest version of Sublime Text.

Go to the Sublime Text download page and click your operating system. A zip file will be downloaded.

User visiting the download page of Sublime Text to start to use HTML

Step 2: Open Sublime Text.

Open the zip file and click on Sublime Text in your Downloads folder. The editor will automatically open.

Step 3: Add HTML.

Copy and paste the HTML below into the editor. We’ll explain what each of these elements mean in the following section.

<!DOCTYPE html>



<h1>My First Heading</h1>

<p>My first paragraph.</p>



Step 4: Save the HTML file.

Select File > Save As in the Sublime menu. Name it “index.html.” Save it to your desktop or another folder.

User saving HTML file to desktop

Step 5: View the HTML file in your browser.

Now you can open the HTML file in your browser. You can either double click on the file, right-click and choose Open, or drag and drop it in an open browser window. It will look like this:

HTML file created with Sublime Text Editor being viewed in Google Chrome browser

Now that you know how to use an HTML editor, let’s look at how to write the actual code.

How to Create an HTML File

To build a website with HTML, you need to create an HTML file first. This file will contain all the HTML for your web page, and will be uploaded to your web server. That way, when a visitor searches for your website, the server will send the HTML file to the visitor's browser, and the browser will render the page accordingly.

Below we’ll walk through the process step-by-step so you can create an HTML file for your web project. We'll create the simplest HTML file possible so beginners can follow along.

Step 1: Add a <!DOCTYPE> declaration.

To start, you need declare the type of document as HTML. To do so, add the special code <!DOCTYPE html> on the very first line of the file.

<!DOCTYPE html>

Step 2: Add an <html> element. 

Next, you'll want to define the root element of the document. Since this element signals what language you’re going to write in, it’s always going to be <html> in an HTML5 doc.

On the line below the DOCTYPE declaration, add an <html> opening tag. Below that, add a closing </html> tag.

<!DOCTYPE html>

Step 3: Add a language attribute.

Within the opening tag of the html element, you should also include a lang (language) attribute. This will help screen readers determine what language the document is in, making your website more accessible. Without a language attribute, screen readers will default to the operating system’s language, which could result in mispronunciations of the title and other content on the page.

Since we’re writing this post in English, we’ll set the file’s lang attribute value to “en.”

<!DOCTYPE html>
<html lang=”en”>

Step 4: Add a head and body section. 

An HTML doc is composed of two parts: the head section and the body section. The head contains meta-information about the page as well as any internal CSS. The browser does not show this information to readers. The body section contains all the information that will be visible on the front end, like your paragraphs, images, and links. To create these sections, add a <head></head> tag and then a <body></body> tag between <html> and </html> in your document.

<!DOCTYPE html>
<html lang=”en”>




Step 5: Add a title in the head section.

In the head section, you'll want to name your document. Write a name (we’ll go with “My HTML Page” in this example) and then wrap it in <title></title> tags.

    <title>My HTML Page</title>

Step 6: Add <style> tags and any internal CSS in the head section.

I’m also going to add <style></style> tags inside the head section. Between these tags, you’d add any internal CSS you’re using to style your HTML. Instead of making up some CSS rules, I’m just going to add a comment in CSS as a placeholder. You can add commends in HTML too for anything you don't want the browser to render.

Note: In many HTML documents, you won’t see style tags or any CSS. That most likely means the page is using an external style sheet, a common way of adding CSS to HTML. In the case of an external stylesheet, you’ll see a link in the head section of the doc.

    <title>My HTML Page</title>

    <link rel="stylesheet" href="style.css"> <!-- This link is only necessary if you’re using an external stylesheet -->


        /* These style tags are only necessary if you’re adding internal CSS */


Step 7: Add HTML elements in the body section.

In the body section, let’s now add a heading and paragraph. You’ll write out the heading name and wrap it in <h1></h1> tags, and write out the paragraph and wrap it in <p></p> tags.


    <h1>This is a Heading</h1>

    <p>This is a paragraph.</p>


Finally, it's a common practice to indent nested HTML elements. Even though this makes no difference to the browser processing the file, indenting visualizes the document's structure and makes it easier to read.

HTML Example

Below is an example of a basic HTML file that any beginner can create. It combines the code written in the steps above.


<!DOCTYPE html>

<html lang=”en”>


    <title>My HTML Page</title>

    <link rel="stylesheet" href="style.css"> <!-- This link is only necessary if you’re using an external stylesheet -->


        /* These style tags are only necessary if you’re adding internal CSS */




    <h1>This is a Heading</h1>

    <p>This is a paragraph.</p>



Below is how it would look on the front end. Note that only the heading and paragraph from the body section are rendered.

HTML example of skeletal file with only a heading and paragraphAs you can see, this is a skeletal HTML file. To fill it in, we need to take a look at some more common HTML elements. We’ve already noted two, the <h1> and <p> elements. Let’s take a closer look at these elements and others below.

If you'd prefer to watch how a more complex HTML file is built out with images, links, forms, and other elements, check out this video:

Common HTML Elements

The first version of HTML consisted of just 18 tags. Since then, four versions have been released with dozens of tags added in each version. In the most recent version, HTML5, there are 110 HTML tags.

HTML elements usually appear lowercase, with a start tag, end tag, and some content in the middle. However, there are elements like <br> that have no content or end tag. These are called empty elements. 

Below we’ll review the most common elements and their tags.

Paragraph (<p>)

The HTML paragraph element represents a paragraph. By placing <p></p> tags around text, you’ll make that text start on a new line.

Here’s an example of two paragraphs:

See the Pen p example by Christina Perricone (@hubspot) on CodePen.


Image (<img>)

The HTML image element embeds an image into the document. It requires a src (source) attribute to render properly. An alt attribute should also be included in case the image doesn’t load properly or the reader has a visual impairment.

Here’s an example of an image with a source and alt attribute:

See the Pen img example by Christina Perricone (@hubspot) on CodePen.


Headings (<h1>-<h6>)

The HTML heading elements represent different levels of section headings. <h1> is the highest section level and the most prominent, whereas <h6> is the lowest and therefore least prominent.

See the Pen headings example by Christina Perricone (@hubspot) on CodePen.


Division (<div>)

The HTML content division (div) element is a generic block-level container for “flow content.” Flow content is a category of HTML elements that contain text or embedded content. The anchor, block quote, and heading elements are considered flow content.

On the back end, div elements help organize the code into clearly marked sections. On the front end, they add line breaks before and after their content. Otherwise, they do not affect the content or layout of the page unless styled with CSS.

Here’s an example of div wrapped around an image:

See the Pen div example 1 by Christina Perricone (@hubspot) on CodePen.

Here, the image looks the same as it did without the div wrapper element. That’s because no style information was given to this div element. To change the appearance of the container and therefore the image inside that container, you’d need to add style information.

Say, for example, you wanted to center the image. Then you could use the following code to horizontally center the image on the page:

See the Pen div example 2 by Christina Perricone (@hubspot) on CodePen.


Span (<span>)

The HTML span element is a generic inline container for “phrasing content." Phrasing content refers to text and any markup it contains, like <abbr> and <audio> tags.

Span tags do not inherently represent anything, but they are used to group phrasing content for two reasons. The first is to apply style information to a particular piece of text. For example, if you’re creating drop caps, you can wrap the first letter of the opening paragraphs of each section of your article in span tags.

See the Pen span example by Christina Perricone (@hubspot) on CodePen.

The second reason to use span tags is to group elements that already share attribute values. For example, maybe you have a website for English speakers learning French. The default language is set to English but on several pages, you might have a table with French terms in the first column and their English translations in the second column. In that case, you can wrap the French terms in span tags with the language attribute set to “fr.”

Anchor (<a>)

The HTML anchor element creates a hyperlink. The anchor element requires an href attribute, which species the destination of the link. The destination can be another section on the same web page or another web page on the same site, or external websites, files, and email addresses.

Here’s an example of a link nested in a paragraph:

See the Pen anchor example by Christina Perricone (@hubspot) on CodePen.


Unordered List (<ul>)

The HTML unordered list element is used for grouping items when the order doesn't matter. Shopping lists, for example, don’t need to follow a particular order. List items must be defined by the <li> tag and then wrapped in the <ul> element.

Here’s an example of an unordered list. Try adding some list items yourself and see how the list changes.

See the Pen ul example by Christina Perricone (@hubspot) on CodePen.


Ordered List (<ol>)

The HTML ordered list element is used for grouping items when the order does matter. Recipes, for example, should follow a particular order. The steps must be defined by the <li> tag and then wrapped in the <ol> element.

An ordered list will start at the number 1 by default. If you’d like to start at another number, simply add a start attribute and set the value to the number you want.

Here’s an example of an ordered list that starts at 1. Try adding steps at different parts of the list:

See the Pen ol example by Christina Perricone (@hubspot) on CodePen.


Emphasis (<em>)

The HTML emphasis element emphasizes the text it contains. Browsers typically render the text in italics.

Here’s an example of the emphasis wrapped around a paragraph and nested within a paragraph:

See the Pen em example by Christina Perricone (@hubspot) on CodePen.


Strong (<strong>)

The HTML strong element indicates that the text it contains is of strong importance or urgency. Browsers typically render the text in bold. Here’s an example of the strong element:

See the Pen strong example by Christina Perricone (@hubspot) on CodePen.


Unarticulated Annotation (<u>)

The unarticulated annotation element marks text as having some form of non-textual annotation. For example, you can use this element to annotate spelling errors. 

See the Pen Unarticulated Annotation Element by HubSpot (@hubspot) on CodePen.

If you’d like to underline text for any other purpose than to represent a non-textual annotation, then use another HTML element or CSS property. For example, if you’d like to underline text for decoration, you’d use the CSS text-decoration property and set it to “underline” instead. If you’d like to underline a book title, then you’d use the cite element.


Table (<table>)

The <table> element creates a table for organizing content in a way that's easy to read at a glance. It requires three other HTML elements: the <tr>, <th>, and <td> tags.

  • The <tr> tag to define a table row.
  • The <th> tag to define the table header. 
  • The <td> tag to define the table data (ie. table cells).

Here's an example of a table:

See the Pen Untitled by HubSpot (@hubspot) on CodePen.


Horizontal Rule (<hr>)

The horizontal rule element defines a horizontal line across a web page. It can be used to mark any thematic change, like the next scene in a play, a new section of an essay, or the conclusion of an article.

Here's an example re-created from The Atlantic of a horizontal rule marking the end of an article and the beginning of the author's bio:

See the Pen Horizontal Rule element by HubSpot (@hubspot) on CodePen.



The select element defines a dropdown list of options, from which a user can select one option (or multiple if allowed). The select element is usually used in HTML forms for gathering user submissions. It’s best for selecting one option out of many while maximizing space on the web page.

See the Pen HTML-only Dropdown by HubSpot (@hubspot) on CodePen.



A section element is a semantic HTML element that represents standalone sections of related content in a web page. For example, a section element can be used to group contact information.

In the example below, section elements are used to split the web page into "About" and "Contact" sections.

See the Pen The Section element example by HubSpot (@hubspot) on CodePen.


Line Break (<br>)

The line break element creates a line break where it’s placed. That means you can add it wherever you want text to end on the current line and resume on the next. This element can be used to display poems, song lyrics, or other forms of content in which the division of lines is significant.

Below is an example of an address rendered in two ways: one using line break elements and one using paragraph elements.

See the Pen Paragraph vs Line Break Element by HubSpot (@hubspot) on CodePen.


Common HTML Attributes

Attributes modify HTML elements in different ways. They can change the appearance of the element, apply unique identifiers so the elements can be targeted by CSS, or provide necessary information to readers or screen readers.

Attributes usually appear lowercase and as name/value pairs, with their values in quotes.

Below we’ll take a look at the most common attributes.

Style Attribute

The style attribute contains inline CSS. This CSS will override any styles set in the head section of the document or in an external stylesheet. It will only be applied to the HTML element that has the style attribute in its opening tag.

Here’s an example of the attribute in HTML:


<p>This paragraph will be black by default. </p>

<p style="color: #800000">This paragraph will be maroon. </p>

ID Attribute

The ID attribute is used to identify a single element in an HTML file. That means the value of an ID attribute should not be repeated inside the same file. Using this unique value, you can target a single element with internal or external CSS.

Here’s an example of the attribute in HTML:


<h1 id=”decorative”>Title in Fancy Typography</h1>

Class Attribute

The class attribute is used to identify a group of elements under the same name and customize that group, effectively creating a new group of elements.

Bootstrap buttons, for example, are all labeled with the .btn class so they have the same basic style: 14px font, medium size, rounded edges, etc.

Here’s an example of the attribute in HTML:


<button class="btn" type="submit">Button</button>

Language Attribute

As mentioned, the language attribute signals to screen readers what the primary language of the web page is and when they need to switch to another language. This is a small detail that can make your content more accessible to all readers, no matter what region they’re from or the language they speak.

While this attribute is most commonly embedded in the HTML element, it can also be used with paragraph, div, span, and other elements.

Here’s an example of the attribute in HTML:


<p lang="fr">Cette phrase est en fran&ccedil;ais</p>

<p lang="es">Esta frase es en espa&ntilde;ol.</p>

Href Attribute

An href attribute contains the destination of a link. This attribute must always be included with an anchor element.

Here’s an example of the href attribute in HTML:


<a href="">go to</a>

Source Attribute

Just like an anchor element needs an href attribute, an image needs a source attribute. This contains the path to the image file or its URL.

Here are two examples of the attribute in HTML:


<img src="images/pineapple.png">

<img src="">

Alt Attribute

The alt attribute provides descriptive information about the HTML element. This is important for readers with visual impairments and for all readers in case the element doesn’t load. In that case, readers will still be able to glean what the element was meant to convey. Like the source attribute, you’ll most often find the alt attribute with the image element.

Here’s an example of the attribute in HTML:


<img src="" alt="Pineapple in grass">

Data-* Attribute

The data-* attribute is used to store custom data that is private to the page or application. You can use this stored data in the document’s JavaScript to create a more dynamic experience for the user.

The asterisk in the data-* attribute can be any value.

Here’s an example of the attribute in HTML from W3Schools:



    <li data-animal-type="bird">Owl</li>

    <li data-animal-type="fish">Salmon</li>

    <li data-animal-type="spider">Tarantula</li>


I could then use this data in the JavaScript to trigger a pop-up message providing more information about each list item. Say, for example, a visitor clicked on the word “Owl.” Then a pop-up box would appear saying “The owl is a bird," as shown in the screenshot below.

data-* atrribute being used to display stored data about list item

Now that we’ve covered the most common elements and attributes in HTML, let’s explore where you can practice writing this language and continue learning more about it.

How to Learn HTML

There are hundreds of resources available to learn HTML for beginners or more advanced developers. Depending on your learning style, you may prefer to read blog posts, watch video tutorials, take online courses, download an ebook, or use a combination of all of these resources.

Below we’ll walk through at least one example of each of these content types. That way, no matter what type of learner you are, you can find a resource that will help you learn this language.

1. The Beginner's Guide to HTML and CSS for Marketers

If you're just starting to learn to code, this free e-book is designed to teach HTML for beginners. It will explain what HTML and CSS are, how they’re different, and how to get started if you're brand new to web development. As the title suggests, this guide is specifically designed for marketers who need to be able to make quick fixes to their websites, blogs, and landing pages.

Table of content for HubSpot's Beginner's Guide to HTML & CSS for Marketers

2. LinkedIn Learning

If you’re a visual learner, check out the online tutorials available at LinkedIn Learning (formerly known as LinkedIn Learning offers 42 courses and over 5,000 video tutorials that cover virtually every HTML topic, from forms to semantic data to everything in between. These lessons are organized into three levels — beginner, intermediate, and advanced — so you can develop your skills over time. To get access to all content on the site, you can sign up for a monthly or annual subscription.

The video below is an excerpt from one course called “HTML Essential Training” by Jen Simmons:

3. Codecademy

If you’re overwhelmed by the sheer quantity of videos available on LinkedIn Learning, try Codeacdemy’s Learn HTML class. This online course will start with the basic structure and elements of HTML. You can then put your knowledge to the test by building out more complex elements and projects, including HTML tables and forms, from scratch.

While you can complete most of the course for free, there are pro features like quizzes and projects that you’ll have to pay to unlock.

Codecademys Learn HTML class overview includes take-away skills and time to complete

4. HTML 4.01 Tutorial by W3C

W3C offers a range of training materials for HTML and CSS. While these tutorials aren't interactive, they're jammed-packed with information relevant to both beginner-level and advanced-level developers.

Don't worry about the interactivity of the courses, as W3C provides a reference page that breaks down the material week by week. In week one you're learning the basics of HTML and its syntax then by week four you're off creating stylesheets and building full sections for your web page. 

W3C HTML Tutorial

5. Learn HTML

Learn HTML is a free interactive tutorial. However, rather than try to be the most comprehensive resource on HTML, Learn HTML offers a short step-by-step guide for building out a web page. At every step, you can test whether you understood the lesson by completing an exercise in the online code editor. If your code matches the expected output, then you’ll get a success message and be invited to move onto the next lesson.

Homepage of first course on Learn HTML

6. HTML Beginner Tutorial by HTML Dog

HTML Dog created an HTML Beginner Tutorial for those who have absolutely no previous knowledge of HTML or CSS. It starts with a general overview of what HTML is and what it’s made of (tags, elements, and attributes). Then it walks through how to build out an HTML file with titles, paragraphs, headings, and other elements. By the end, you’ll have walked though how to create a complete HTML file. 

This is similar to W3Schools and Learn HTML — but it invites you to build out the HTML file in your editor of choice, instead of a built-in one. It specifically recommends Notepad.

HTML Beginner Tutorial by HTML Dog7. HTML Specification by W3C

The HTML spec by W3C is the living standard for HTML. While it’s not the easiest introduction to the topic, it is the most comprehensive. That’s why we recommend checking it out once you’ve gone through some courses or tutorials and have established some familiarity with web technologies.

HTML specification by W3C with table of contents

Now you’re ready to code.

HTML is the language we use to talk to computers. It is how browsers display text, images, paragraphs, and other elements on a web page.

As such, HTML is the predominant language of the World Wide Web. That makes the language important not only to people trying to become programmers, but to marketers like yourself. Knowing the basics of this markup language will allow you to make changes to your website without needing to rely on a developer, saving you and your business time and money.

Editor's note: This post was originally published in August 2020 and has been updated for comprehensiveness.

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