§6 · Learn
Books written to be kept, not skimmed.
3 courses, 112 chapters, about 31 hours of reading. Every chapter opens with a question to guess at, keeps a tutor in the margin who has read it, and ends by asking you for one sentence of your own. 1509 recall cards bring the ideas back on a schedule, sooner when you miss.
Thinking in Vectors
From "what is a vector?" to shipping retrieval over a hundred million documents.
Why AI Agents Forget
Memory for AI agents in five-minute reads: what to store, when to write it, how to find it again, and what it costs to be wrong.
The Kubernetes Ninja Path
Thirty-five posts for an engineer coming back to work after time away, who remembers basic Linux and nothing else.
Guess first
Each chapter opens with one of its own recall questions. A wrong guess before reading makes the right answer stick harder than no guess at all.
A tutor in the margin
Ask the tutor anything, or select a sentence and ask about that. It has read the chapter, uses the chapter's own analogies, and will not invent what the book does not say.
One sentence of your own
At the end you write what the chapter was about, from memory. It is graded against the author's takeaways, and you see what you had and what you missed.
Spaced recall
Every takeaway becomes a card. A miss comes back tomorrow; a confident hit waits longer each time. Sure-and-wrong is recorded, because it is the most expensive kind of not knowing.