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.
In Solo: A Star Wars Story, we see Han’s stent in service to the Empire in only one scene as he defects from the ground troops on Mimban, fatefully befriends Chewbacca, and hitches a ride with Beckett’s crew. Han Solo: Imperial Cadet gives us the story of what happens to our favorite soon-to-be smuggler after he enlists on Corellia and before his mission to Mimban. In fact, this series shows how he was training to be a TIE fighter pilot, but how things quickly went awry. Plus, the series reintroduces the character of Valance, who goes on to star in Marvel’s Target Vader and Bounty Hunters titles!
Untold adventures of a young Han Solo! You've seen Han escape the mean streets of Corellia by joining the Imperial Navy. But how does a thief used to the chaos of back alley brawls adjust to the order and discipline of the military? Not very well! And Han's dream of becoming a pilot is quickly grounded as he realizes he may not even survive basic training. After a wild sequence of events lands him in the brig overnight, Han is given one last shot at flight school. Will Han be top gun - or will he crash and burn? And who is his mysterious rival, ripped from the pages of classic Star Wars comics?