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's had a plan to auction off an artificial Jedi intelligence in order to make some major credits. Unfortunately, things haven't exactly gone according to plan... Darth Vader is back, and our rogue archaeologist is less dead than he thought he had left her.