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.
In this second installment of a three-part story, the mighty Wookiees of Kashyyyk must defend their home against the armies of the evil First Order. Plus, R2-D2, C-3PO, and BB-8 team up on a top-secret spy adventure for the Resistance.