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.
The Empire is dying; but like a dog near death, the Empire is at its most dangerous, ready to lash out with nothing to lose. Grand Admiral Thrawn may have found just the firepower needed to take a bite out of the New Republic: some two hundred Dreadnaught heavy cruisers, lost to hyperspace in the days of the Old Republic. Luke, Leia, Han, and Chewbacca may be up against more than they bargained for, but it's not the first time the odds have been stacked against them!