I think dogs, cats, and fish are probably the easiest. Also, hermit crabs? I heard a lot of people like them cuz you pretty much buy them and paint their shells and then they just lay around and chill lol. Hamsters arent too bad to take care of either. You just have to make sure to clean their cage regularly, and play with it. The only issue is that they get hyper at night and run a lot on their little wheel, so if you kept it in your room it might keep you awake at night.