My favorite is "48 Laws of Power" by Robert Greene. The book was given to me by a colleague at work. He said he wants to help me improve the way I see and handle difficult situations and people in my life. This book is about having power over people who try to harm you, having power over unfortunate events in your life, about how easily it is to get what you want using psychology, etc. I read this back in 2016 when I was really down because of a recent heartbreak. My friend said he wanted to help me and he said this book will help me. It did. Now, I am aware of those things that others may do to harm you and how you can respond to them in a very professional way.