How these are made.
You are being asked to take advice about a machine from a book. It is fair to ask how the book was made.
One shape, twenty-five times
Every book is twelve chapters, a library of 150 numbered prompts, a glossary that assumes nothing and a thirty-day plan. Chapters one to three are the same job in every trade — get set up, learn the one skill — and everything after them is that trade's own paperwork. The shape is deliberate: it is what lets a nurse and a plumber be given the same quality of book.
Where the hours figure comes from
It is the authors' arithmetic, not a measurement, and it is shown row by row on the hours table so you can check the addition. The qualification is printed beside the number everywhere it appears, rather than under it in smaller type.
Who checked them
The compliance-sensitive material — the rules chapters, the privacy lines, the licence warnings — was reviewed by Greenlight's compliance officer, and three books say so by name in their front matter where a narrower claim had been made before. Where a review did not happen, no review is claimed.
The drawings
The twelve chapter openers in each book, three hundred in all, and the drawings on this site are all made against a single reference sheet. That is what keeps them one hand rather than twenty-five.
What we will not tell you
That AI is magic, that it is coming for your trade, or that any of this is free of judgment. Each book ends its Promise Page with a version of the same line: it is a power tool, it kicks, and the book will show you where.