The Mandalorian is a bounty hunter that was hired to kill a valuable asset that turned out to be a child. Unable to kill it, he goes off the map with it.
When the war is almost coming to an end, the Sith recruit a new Sith Lord that will bring them to the winning side.
At the end of The Last Jedi, Luke Skywalker died, and now it is up to Rey and her friends to find the mysterious Palpatine and his Final Order determined to wipe out the galaxy.
Yup, it all started with this. The entire Star Wars Franchise started with this movie. It is an older movie, I get it, but it still is fun. In this movie we begin to learn how the Star Wars universe came to be. Though all the other Star Wars movies are great in my opinion, this one is definitely important.