By far, the easiest fish to keep are damsels, but since there is a downside to every fish, damsels tend to be extremely aggressive. Part of what fish you should get depends on the tank size and what kind. My first tank was a 36 gallon bow front (great beginner tank). It was FOWLR. I did not cycle my tank, which is a pretty bad idea. I decided to go with the hardiest fish, damsels. After letting my tank sit for a while, I went to my LFS and picked up some damsels. I got a blue damsel, a yellowtail damsel, and two humbug damsels. I went home and begun to acclimate my fish when one of my humbugs jumped out and died a couple days later. After a couple months I moved on to get some more fish. I got two ocellaris clownfish, which are very hardy. With clownfish, you have to be careful because they will fight conspecifics and two females will fight to the death. Normally you should ask for a mated pair, but beware, they might spawn in your tank. I know damsels are very hardy because in my experience, one of my friend's damsel got stuck in his protein skimmer and lived there for 4 days. When he returned him to the tank and he was perfectly fine. Damsels are also reef safe, although I once caught my humbug picking at one of my zoas. Most people will tell you to not get damsels because of aggressiveness and I do agree with them but there are some that are not as aggressive. My yellowtail damsel is not aggressive and they tend not to be. Same with a talbots damsel. Try those to begin. Clownfish are also in the damsel family but not as hardy. Perculas and ocellaris are not aggressive so if you want to try those, go ahead. With damsels, throughout the hobby, take good consideration of what fish you are going to get next. Marine Fishes is a great fish book to tell you what to get. Have fun!