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.
Cassian Andor is one of the top intelligence agents in the ranks of the Rebel Alliance, ably assisted by his reprogrammed Imperial security droid, K-2SO. But naturally, the two weren't always on the same side of the Galactic Civil War. Now, for the first time, read the story of the pair's first contentious meeting! It is very likely not to go well.