If you could only read 1 book with actionable advice. what is it?

[Scott Hibbert]

I am curious if you could only read/recommend one book with actionable advice for an REI newbie what would it be and why? It doesn't have to be a real estate book. It could be a business book like "The One Thing". I have read a number of books from Rich Dad Poor Dad to Start With Why but would really like to know the one book that moved the needle the most for you and took action because of it.