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.
We all know that one day, Boba Fett will become the most fearsome bounty hunter in the galaxy. But right now, in the Clone Wars world, he's just a lost boy with a dark past. However, when young Boba tracks down the Jedi that robbed him of his childhood, he finds himself taking the first steps toward his destiny.