You've got some homework to do. Watch: The Phantom Menace, Attack of the Clones, The Clone Wars, Revenge of the Sith, Solo, Rebels, Rogue One, A New Hope, Star Wars Holiday Special, The Empire Strikes Back, Caravan of Courage, The Battle for Endor, Return of the Jedi, The Force Awakens, Resistance, and The Last Jedi

Or completely ignore that and just watch the Rise of Skywalker trailer here