Learn web development

Welcome to the MDN learning area. This set of articles aims to provide complete beginners to web development with all that they need to start coding simple websites.

The aim of this area of MDN is not to take you from "beginner" to "expert" but to take you from "beginner" to "comfortable". From there you should be able to start making your own way, learning from the rest of MDN and other intermediate to advanced resources that assume a lot of previous knowledge.

If you are a complete beginner, web development can be challenging — we will hold your hand and provide enough detail for you to feel comfortable and learn the topics properly. You should feel at home whether you are a student learning web development (on your own or as part of a class), a teacher looking for class materials, a hobbyist, or someone who just wants to understand more about how web technologies work.

Important: The content in the learning area is being added to regularly. If you have questions regarding topics you'd like to see covered or feel are missing, see the Contact us section below for information on how to get in touch.

Where to start

Note: Our glossary provides terminology definitions.

Random glossary entry

stylesheet is a set of CSS rules used to control the layout and design of a webpage or document. Internal stylesheets are placed inside a style element inside the head of a web document, and external stylesheets are placed inside a separate .css file, which is applied to a document by referencing the file inside a link element in the document's head.

Topics covered

The following is a list of all the topics we cover in the MDN learning area.

Getting started with the web
Provides a practical introduction to web development for complete beginners.
HTML — Structuring the web
HTML is the language that we use to structure the different parts of our content and define what their meaning or purpose is. This topic teaches HTML in detail.
CSS — Styling the web
CSS is the language that we can use to style and lay out our web content, as well as adding behavior like animation. This topic provides comprehensive coverage of CSS.
JavaScript — Dynamic client-side scripting
JavaScript is the scripting language used to add dynamic functionality to web pages. This topic teaches all the essentials needed to become comfortable with writing and understanding JavaScript.
Accessibility — make the web usable by everyone
Accessibility is the practice of making web content available to as many people as possible regardless of disability, device, locale, or other differentiating factors. This topic gives you all you need to know.
Web Performance — making websites fast and responsive
Web performance is the art of making sure web applications download fast and are responsive to user interaction, regardless of a users bandwidth, screen size, network, or device capabilities.
Tools and testing
This topic covers the tools developers use to facilitate their work, such as cross browser testing tools.
Server-side website programming
Even if you are concentrating on client-side web development, it is still useful to know how servers and server-side code features work. This topic provides a general introduction to how the server-side works, and detailed tutorials showing how to build up a server-side app using two popular frameworks — Django (Python) and Express (node.js).

Getting our code examples

The code examples you'll encounter in the Learning Area are all available on GitHub. If you want to copy them all to your computer, the easiest way is to download a ZIP of the latest master code branch.

If you'd rather copy the repo in a more flexible way that allows for automatic updates, you can follow the more complex instructions:

  1. Install Git on your machine. This is the underlying version control system software that GitHub works on top of.
  2. Sign up for a GitHub account.
  3. Once you've signed up, log in to github.com with your username and password.
  4. Open your computer's command prompt (Windows) or terminal (Linux, macOS)
  5. To copy the learning area repo to a folder called learning-area in the current location your command prompt/terminal is pointing to, use the following command:
    git clone https://github.com/mdn/learning-area
  6. You can now enter the directory and find the files you are after (either using your finder/file explorer or the cd command).

You can update the learning-area repository with any changes made to the master version on GitHub with the following steps:

  1. In your command prompt/terminal, go inside the learning-area directory using cd. For example, if you were in the parent directory:
    cd learning-area
  2. Update the repository using the following command:
    git pull

Contact us

If you want to get in touch with us about anything, the best way is to drop us a message on our learning area discourse thread or IRC channels. We'd like to hear from you about anything you think is wrong or missing on the site, requests for new learning topics, requests for help with items you don't understand, or any other questions or concerns.

If you're interested in helping develop/improve the content, take a look at how you can help, and get in touch! We are more than happy to talk to you, whether you are a learner, teacher, experienced web developer, or someone else interested in helping to improve the learning experience.

See also

Mozilla developer newsletter
Our newsletter for web developers, which is a great resource for all levels of experience.
Web demystified
A great series of videos explaining web fundamentals, aimed at complete beginners to web development. Created by Jérémie Patonnier.
A great interactive site for learning programming languages from scratch.
Basic coding theory with a gamified learning process. Mainly focused on beginners.
Basic coding theory and practice, mainly aimed at children/complete beginners.
Free and open courses for learning tech skills, with mentorship and project-based learning
Interactive site with tutorials and projects to learn web development.
Web literacy map
A framework for entry-level web literacy & 21st Century skills, which also provides access to teaching activities sorted by category.
Teaching activities
A series of teaching activities for teaching (and learning) created by the Mozilla Foundation, covering everything from basic web literacy and privacy to JavaScript and hacking Minecraft.
Hundreds of free interactive coding challenges in various languages.