Bunnies' teeth are constantly growing, so they need plenty of hay, wood toys, boxes, and other chew toys to keep their teeth filed down properly. Your house will need bunny-proofed as they will chew everything specially your wires!
One of the biggest threats to pet bunnies is GI Statis. GI statis is when bad bacteria builds up in the intestines and releases gas into the system, causing very painful bloating and further decreasing a rabbit’s motivation to eat or drink. Your bunny ever stops eating, is crouched like a meatloaf, and has no interest in favorite treats, it is an emergency. Take him/her to a bunny-savvy vet immediately and/or attempt a tummy massage to dislodge gas and give them baby gas medicine found at your local pharmacy (I am not a vet so please contact your vet before doiing so.This is just what I do when this occurs.)
Rabbits have very sensitive digestive systems and they can't vomit hairballs like cats. It's essential to give endless hay and supplement with high-fiber pellets. Brushing your bunnies fur will help them not ingest as much fur. Rabbits can live up to 14 years. They're fluffy, cute and sound simple in theory, but they are a serious commitment of a daily responsibility for the next 9+ years. A decision of this big requires serious thought and research.
Rabbits do NOT need a rabbit companion. You are plenty of a companion for your rabbit, A mistake people make is to get two at once. Many people find that one bunny is plenty to care for. Spaying/neutering can cost $300 per rabbit. They may also require separate cages if bonding isn't successful. Begin to contemplate a second bunny, only after your first has been spayed/neutered.