Learn how AI really works.
Play with it. Then you'll never be fooled by it.
Sixteen short, friendly lessons. Each one has a real thing you can poke at, a tokenizer, a temperature dial, a real AI you can talk to, an agent calling a tool, an image generator, a reasoning model thinking out loud. Built for curious humans of any age.
- 16lessons≈ 85 minutes total
- 12live demosReal AI in your browser
- 0jargonPlain words, no math
- $0always freeNo sign-up, no ads
The course
Your progress is saved in this browser, no account, no email.
What is AI?
- Lesson 1What even is AI?A friendly tour of what "AI" actually means, and what it doesn't.
- Lesson 2What is a Large Language Model?Meet the "really big autocomplete" that powers ChatGPT, Claude, and friends.
- Lesson 3How does an LLM learn?A peek inside "training", how billions of guesses become a knowing-ish AI.
How LLMs actually work
- Lesson 1Tokens: the puzzle pieces of languageAIs don't see letters or whole words. They see "tokens." Let's break some.
- Lesson 2Prompts: how to talk to an AIThe way you ask is half the answer. Try it with a real model.
- Lesson 3Temperature: the AI's diceWhy the same question can get different answers. Turn the dial yourself.
- Lesson 4Embeddings: turning meaning into numbersHow an AI knows that "dog" and "puppy" are friends, but "dog" and "spaceship" are not.
Strengths & limits
- Lesson 1Hallucinations: when AI sounds confident but is wrongThe most important AI failure mode, explained. Spot one yourself.
- Lesson 2Bias: AI learns from us, including our mistakesWhy a model trained on human text can repeat very human unfairness.
- Lesson 3Using AI well: when to trust it, when to double-checkA short, practical guide to making AI your teammate, not your boss.
AI that does things
- Lesson 1Tool use: giving the AI handsAn LLM by itself can only talk. Tool use is what lets it do things like check the weather or do real math.
- Lesson 2Agents: AI that works for youAn agent is an LLM that doesn't just answer, it plans, acts, and keeps going until the job is done.
- Lesson 3Oversight: keeping agents on a leashHow to let an AI agent help without letting it cause real damage. The pilot-and-autopilot rule.
Beyond text
- Lesson 1Multimodal AI: more than just wordsModern AI doesn't just read and write. It sees, hears, and creates pictures, sounds, and video.
- Lesson 2RAG: looking it up firstHow AI gives accurate, sourced answers, by reading the right page before it speaks.
- Lesson 3Reasoning models: AI that thinks before it answersWhy some 2026 models pause, scribble in a notebook, and then answer. And why that's a big deal.