It adds to the backstory of a beloved character, Han Solo. By showing his origin, it enriches the overall Star Wars lore. It also expands the universe by introducing new locations and factions.
Solo: A Star Wars Story contributes in multiple ways. It gives us a deeper understanding of Han Solo's character development. It shows his early experiences that shaped him into the hero we see in the original trilogy. The movie also showcases different aspects of the Star Wars underworld, like the criminal syndicates, which we didn't see as much in other Star Wars movies. This helps to flesh out the franchise's universe further.