BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
The Youtini Expanded Universe Ranking system is a 1-5 scale that ranks EU book quality, difficulty, and importance. Books closer to Level 1 are easier to read and understand, more important, and of higher quality.
Star Wars Episode I Journal: Darth Maul is a novel from the point of view of Darth Maul surrounding the events of The Phantom Menace. There are twelve entries that Maul has written for the Sith Archives. Each show his past, his plans, and his missions, ending where he plans to battle Qui-Gon Jinn and Obi-Wan Kenobi on Naboo. An epilogue is made by Darth Sidious, reporting the supposed death of his Sith apprentice, as well as commenting on his failures and excellent skill as a swordsman.