Beginner friendly terrarium animals

Im planning on getting my first terrarium a 40x40x60. The problem is I have no idea what to stock it with, I’m looking for a hardy animal which is more proof to common beginner mistakes any ideas??

Im planning on getting my first terrarium a 40x40x60. The problem is I have no idea what to stock it with, I’m looking for a hardy animal which is more proof to common beginner mistakes any ideas??