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.
When Chewbacca the Wookiee finds out that a job he thought was just ferrying tooka cats is actually much more, he's excited to have something to do! But when he, a young bounty hunter/librarian, and a droll cargo droid–who, unbeknownst to the others is rebel spy droid K-2SO–land in the middle of a blue forest that emits a fear-causing mist, Chewie realizes the job may be too dangerous for his liking. He and his companions will have to fight off snarlers, sniffers, and their own fears as they try to recover a sacred book–and rescue Han Solo in the process!