You can see the general cheat sheet here. Below is a list of items I really enjoy and have found value in.
Books
Philosophy
Living Freemasonry
The Kybalion
Spirituality
Siddhartha
The Secret Doctrine
The Secret Teaching of All Ages
Ethics
Leadership
Extreme Ownership
The 7 Habits of Highly Effective People
Principle Centered Leadership
The Infinite Game
Start with Why
Leaders Eat Last