Learn how things work
Each guide is one page, read top to bottom: short chapters, each built around an animation you can play or step through. They start from the basics, and your progress is saved in this browser.
How the Web Works →
What really happens when you load a web page — DNS, HTTPS, HTTP, cookies, CORS, caching, APIs and rendering — explained step by step with an animation for every idea.
How JavaScript Works →
One page, start to finish: how the engine runs your code, where your data lives in memory, how async works, and what the browser does with it all — every idea with an animation you can step through.
How LLMs Work →
From tokens and probabilities to tools, agents and retrieval — how large language models actually work, and how to build reliable features on them, with an animation for every idea.