Web Development
Responsive Design Basics
How to make a page work on a phone: the viewport tag, mobile-first media queries, flexible units, and the four things that…
Web Development
HTML, CSS and the pieces that turn code into a page people can visit. Build layouts that work on a phone, and understand what the front end and back end each do.
4 guides
Web Development
CSS Basics Explained
Selectors, the box model, flexbox and grid — the four things that account for most of what you will do in CSS,…
Web Development
HTML Basics Explained
The HTML tags that actually matter, why semantic elements beat divs, how forms and links work, and the accessibility basics that take…
Web Development
Web Development for Beginners: A Map of What to Learn
What HTML, CSS, JavaScript, the front end and the back end each do, how a page actually reaches your screen, and the…
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Where to go next
Programming Basics
The ideas every language shares — variables, loops, functions and how a program actually runs.
10 guides
Python
Plain-English Python guides, from your first line of code to small programs that do real work.
14 guides
JavaScript
How JavaScript works in the browser, explained with short examples you can paste and run.
11 guides
Keep going — pick your next guide
The fastest way to improve is to read one guide, then build the thing it describes. Start with the basics, or jump straight to a project.