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 tyranny has ended, but what will take its place? Five years after Return of the Jedi, Leia and Han are married and have shouldered heavy burdens in the government of the New Republic, and Luke Skywalker is the first in a hoped-for new line of Jedi Knights. But thousands of light-years away, the last of the Emperor's warlords, Grand Admiral Thrawn, has taken command of the remains of the Imperial fleet. Thrawn has made two vital discoveries that could destroy the Rebel Alliance's New Republic -- two discoveries whose names both end in Solo!