Reality Hacking: Avery Hayden
This book helped me learn to take life less seriously and to take matters into my own hands. I used the techniques in the book to improve my day to day experience and become more confident. It's short and cheap too, which I appreciated.
Taught me to pace myself and helped me break a lifelong habit of burning out. Interesting with a lot of compelling studies. Great book.
What books helped you? Have you read these books? What did you think?