I had a few books growing up that I came across that I really enjoyed.

Getting Started with Electronics was a Radio Shack book I owned that I used to learn the basics of circuits.

Surely You're Joking Mr Feynman was a book I came across back in high school that opened my eyes more to self teaching / learning and curiosity.

Later on in college I came across How to Solve it by Polya that opened my eyes up to ways to approach problem solving.

I also stumbled on Thinking as a Science by Henry Hazlitt which had a great approach to learning something new.