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.
Doctor Aphra is being blackmailed by Triple-Zero to run missions for his underground crime syndicate — but that doesn't mean she can't cause trouble and have fun along the way! Sometimes that fun means infiltrating Rebellion training grounds…and sometimes that trouble means crossing paths with famed rebel Hera Syndulla herself!