Learn generative AI by building it.
Understand it. Build it. Break it. Fix it. A guided playground that teaches tokens, attention, RAG, tools, and production judgment — without live API keys or lecture videos.
Free to use, with no login needed for the first lessons.
20
Module 1 lessons live
16+
Reusable interaction types
5
Modules on the roadmap
The method
Every lesson, you build a system like this.
Push it until it breaks, then repair the failure. Simulations are curriculum-authored so every learner sees pedagogically reliable outcomes.
Step 1
User
Step 2
Prompt
Step 3
LLM
Step 4
Response
The Curriculum
Module 1 is live. Later modules unlock as we ship Releases B–E.
- 00Welcome: You Are Going to Build AI SystemsGuest free
- 01What Actually Is AI?Guest free
- 02What Is a Model?Guest free
- 03How Does a Model Learn?
- 04Training, Validation, Testing, Inference
- 05Neural Networks Without the Scary Math
- 06Tokens: LLMs Don't Read Text Like You Do
- 07Context Windows
- 08Embeddings: Meaning as Numbers
- 09Why Transformers?
- 10Attention
- 11Query, Key, Value
- 12Self-Attention
- 13Inside a Transformer Block
- 14Encoder, Decoder, and Decoder-Only Models
- 15What Is an LLM?
- 16The Flagship Next-Token Simulation
- 17Logits, Probabilities, Softmax
- 18Sampling
- 19Why Can an LLM Follow Instructions?
- CHBuild challenge + Break It
Ready when you are
Enter without an account, complete the first interactive lessons, then save progress when you hit a natural boundary.