Potsdam, a satellite of of Berlin that smoothly turns into Berlin itself, is associated primarily with the Sanssouci park and palace. This is a very green city, with huge expanses of water around, there are not one or two palaces in it, although it is not necessary to visit all of them.
Potsdam can be a good base from which to explore Berlin and the surrounding area. It is cheaper to live here than in Berlin, you can rent a good apartment. But you need to settle either not too far from the station, or have access to highways, that is, do not go deeper into the city center.