I found a huge ass book at this hole in the wall thrift store. It basically diagrams and explains everything about how an automobile works; but it was printed in the early 80's, so pretty out of date. However, it still taught me quite a bit and I'm essentially invulnerable against mechanics trying to fuck me.
The knowledge was worth way more than $1
Edit: Trying to find it so I can disclose the correct title
*Title is – Automotive Principles and Service
Published by Reston Publishing Company inc.; 1980