The Secrets of the Jedi is a book authored by Luke Skywalker, a Jedi Master, where he documented the history of the Jedi Order. This occurred during his period of self-imposed exile on Ahch-To, a planet that housed the First Jedi Temple. Skywalker wrote down his understanding of the Jedi and their practices. The book also contained details regarding the Chosen One and midi-chlorians, both of which shaped the Jedi's core tenets. Furthermore, the work expanded upon subjects like the Jedi Code, the light and dark aspects of the Force, a compilation of Jedi Masters and Knights, their hierarchical structure, the Sith Order, different types of lightsabers, methods of lightsaber combat, various Force powers, and appropriate locations for Force worship. It further detailed his interactions with Rey, a young woman seeking training in the Jedi arts and assistance in a conflict against the First Order, an event that took place shortly before Skywalker's passing and union with the Force.