You can learn a lot about the main philosophy of the Jedi by watching the Star Wars films, but if you want specifics, you're going to want this. The Jedi Path: A Manual for Students of the Force includes "writings" from ancient Jedi Masters, as well as personal commentary from more recognizable faces like Yoda, Obi-Wan, Anakin, and Luke. The book itself arrives in a motorized vault and comes with multiple removable trinkets, similar to the Book of Sith - which is a must purchase for those looking to study the nuances of the Dark Side.
Price $100