The Art of Learning by Joshua Waitzkin. I was definitely in the right place to take in the topic, but it was, more or less, a book on how you can be "good" without much effort, but to be great or the best, it takes a lot of hard work and time. This book helped me learn that lesson.

On top of that, some of Tim Ferriss' stuff on accelerated learning. Learn how to learn first, then learn everything else.