Once you further advance your game pick up "The Psychology of Poker" by Alan N. Schoonmaker. It's a great read and here are some of the things you will learn when reading it.

How to play against:
-Loose-Aggresive
-Loose-Passive
-Tight-Aggresive
-Tight-Passive

It also let's you rate yourself on what kind of player you are, helps teach you the reality of poker, and how to change your bad poker habits into profitable choices for the long term. This book is $25 but you can get it off Pokerstars for FPP.