For the purpose of any TTRPG campaigns that I run, the Star Wars universe follows Legends canon—the collective expanded universe established by various books and other media prior to 2014, rather than by Disney's Star Wars movies.
Specifically, my campaign settings use G-canon (George Lucas's original six movies), T-canon (TV shows prior to 2014), and C-canon (all licensed books, comics, and games from before 2014). Details and features from secondary canon (such as the Star Wars Holiday Special) and non-canon sources can inform the canon, as can details from the Disney movies, but these sources are not considered binding, and are superseded by G, T, and C-canon wherever there is disagreement (see Levels of Canon).
To the limited extent that it might matter to the setting, my campaigns also follow the theatrical releases of the original six movies, rather than the later re-released special editions. This means that, for example, "Han Shot First" when he killed Greedo in the Mos Eisley cantina, and that the Sarlacc pit on Tatooine does not have a giant beak sticking out of it.
Additionally, where possible, all Star Wars TTRPG campaigns that I run or participate in are assumed to take place in the same shared timeline.
For the most part, I generally intend to play fast and loose with the established Star Wars canon, treating it more as a framework to build on rather than as a rigid self-contained setting. Campaigns that I run will make heavy use of GM-original planets, species, starships, etc., while ideally still including enough canonical features for the universe to feel recognizable as Star Wars, and enough obscure lore easter eggs to satisfy those very familiar with the setting.
The Star Wars expanded universe is enormous, and if there's something in particular that a player would like their character to be, do, or have, there is a good chance that something analogous already exists somewhere in the canon for them to pull from. That said, if the thing they want doesn't already exist, or if they can't be bothered to track down whether it exists or not, players should generally feel free to work with me to make up something original, so long as it generally fits in with the feel of the Star Wars setting.
For more of my thoughts on Star Wars as a generalized template for science fiction TTRPGs, see the Why Star Wars? page.