Understand to the Core — the handbook series
A free handbook series across five categories — written on a single rule: explain the mechanism, not the steps.
Knowledge that used to sit scattered across private notes, turned into books other people can pick up and use.
Most guides tell you which button to press. The moment your situation doesn't match the page in front of you, you're stuck. This series takes the other route — explain the mechanism underneath first, and the steps become something you can work out yourself.
What's in it
They span dev, ai, pm, finance and life. Every book exists in both Thai and English, and the longer ones split into a page per chapter so a search can land on the exact topic.
They run from Git, System Design, tmux and CI/CD through the anatomy of a prompt, building a second brain with AI, and engineering the harness around an AI agent — out to the non-technical end: Bitcoin, stocks, and the order you eat your food in.
How they're written
- Zero to working in a single book, with a difficulty band on every chapter so you know what you can skip
- Diagrams drawn per book — not decoration to fill the page, but images that carry the explanation themselves
- Examples taken from things actually built and actually broken, not tidy invented ones
Why they live here
Because reading is part of the content — the typeface, the measure, a table of contents that knows where you are, code that stays readable on a phone. You only control those if you haven't handed the reading experience to someone else's platform.
Browse the whole shelf via the button above. All of it is free.