Courses · Level 3 Engineer
RAG From Scratch
Retrieval you build yourself — and then actually measure.
Retrieval you build yourself — and then actually measure.
Built from scratch in the browser with no framework, so you see every moving part: meaning as geometry, real vectors and cosine similarity over a live corpus, chunking strategies you can feel the tradeoffs of — and then the chapter almost nobody teaches, where you measure whether retrieval actually helped.
Press play and a teacher talks you through the whole build, with a read-along transcript that highlights as it speaks.
Working, offline interactives — not screenshots. When the narration says "try it", the thing is right there.
No account, no app, no subscription. It runs from a single HTML file and will still run in ten years.
Every number is computed live on the page from inputs you can edit. Nothing is asserted that cannot be checked.
Written for builders whose AI needs to know their documents.
Explain embeddings as geometry, not magic
Build working retrieval end to end without a framework
Choose a chunking strategy for a specific document shape
Measure retrieval hit-rate before and after a change
13 chapters, the first four free
The free preview is not a teaser: those chapters are complete, and the paid chapters are physically absent from the preview file rather than hidden behind a script.
What this hour is, how to use the page, and the interactive demo you will keep coming back to.
Part of the free preview — the full narration, page content and exercises, nothing held back.
Part of the free preview — the full narration, page content and exercises, nothing held back.
Part of the free preview — the full narration, page content and exercises, nothing held back.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.