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Web Development

10 lessons

Understand how the web works — HTML, CSS, JavaScript, browsers, HTTP, and APIs.

  1. 1

    What Is the Web?

    Understand what the World Wide Web is, how it differs from the internet, and how pages are delivered.

  2. 2

    HTML

    Learn HTML — the markup language that gives every web page its structure and content.

  3. 3

    CSS

    Learn CSS — the language that controls how web pages look, from colors and fonts to layout.

  4. 4

    JavaScript

    Learn JavaScript — the programming language of the web that makes pages interactive.

  5. 5

    Browser

    Understand what a web browser does — rendering, JavaScript execution, caching, and storage.

  6. 6

    HTTP

    Learn HTTP — the protocol that transfers every web page, and the status codes that describe responses.

  7. 7

    URL

    Understand URLs — the addresses that locate every resource on the web, and what each part means.

  8. 8

    JSON

    Learn JSON — the data format that APIs use to exchange information between clients and servers.

  9. 9

    API

    Understand APIs — how applications talk to each other, and how REST APIs structure requests and responses.

  10. 10

    Browser DevTools

    Learn to use browser DevTools — the built-in toolkit for inspecting, debugging, and profiling web pages.

Build real projects

Apply what you learned by building guided projects with starter code and solutions.

View projects

Decode error messages

Plain-English explanations of common errors — what they mean, why they happen, and how to fix them.

View errors