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 has captivated millions worldwide for forty years. The phenomenon began with the 1977 theatrical debut of Star Wars, later retitled A New Hope, and has expanded to include seven additional major motion pictures (The Empire Strikes Back, Return of the Jedi, The Phantom Menace, Attack of the Clones, Revenge of the Sith, The Force Awakens, and Rogue One), television programming, publishing, video games, and much more, with new films coming every year. The Last Jedi releases in theaters on December 15, 2017.