This manual teaches about plumbing, electricity, and how to repair things. Most useful, however the part I like the best is the how to make stuff chapter at the back of the book. Need a sofa, kitchen table with chairs, rolling file cabinet, tea tray, brick barbecue? The book tells you how to make these things and more, and has instructive photographs. It's amazing!
Personally, I couldn't master even the tea tray, but I enjoy imagining I could. None of the projects feature a lot of ornamentation; the designs are very clean, like the sort of furniture one would find in a Frank Lloyd Wright house. Very nice!