Learn something by building something, one finished page at a time

Every lesson is a small, complete project with an editable copy right beside the guide, plus the teaching notes for how to build it from nothing. You do not need an account and you do not need to install anything.

Courses

7 lessons

HTML and CSS

Build web pages you can see. No JavaScript in this course.

Your First Page · Postcard · Geological Wonders

11 lessons

JavaScript

Make a page do things: buttons, loops, and decisions.

Zoo Webpage · Times Table Grid · Savings Goal Counter

4 lessons

Make a Platformer

Build a scrolling jump-and-run game from rectangles.

The Game Loop · Gravity and Jumping · Platforms and Collisions

5 lessons

3D on the Web

Shaders, meshes, and a solar system you can click.

Your First Triangle · A Program Per Pixel · Your First Scene

3 lessons

Quantum Computing Math

Five hours of background, every idea checked in NumPy.

Qubits and Complex Numbers · Multi-Qubit States and Gates · Exponentials, Fourier and Interference