'Machinery's Handbook' is my choice for metalworking.
'Drive to Win' and the other Carrol Smith driving books ('Engineering to Win', 'Tuning to Win') are great for people that want to get into high performance driving.
the 'U.S. Army Field Manual 3-05.70' is a fantastic introduction to survival bushcraft.
GNU's 'Introduction to the Command Line' is good for beginning the life-long journey into *nix CLI expert-dom.
Borovik's and Gardiner's The Essence of Mathematics Through Elementary Problems is a great technical overview of math
How to Win Friends and Influence People remains the definitive guide on soft-skills
"Let It Rot!" is a good guide to composting
Then I read Machinery of Life by David S. Goodsell https://www.goodreads.com/en/book/show/6601267
I was just plain amazed that a subject can be presented in such a way.