I had a cat pass away years ago who I'd had since she was a 3 month old kitten (she died at 7 yrs old). I was so heartbroken, I just couldn't bring myself to get another cat but around 6 months later, I woke up one day arbitrarily determined to get "a bunny" lol. I hadn't had a rabbit in nearly 2 decades, but by the end of the day I'd bought starter supplies and procured two adorable baby girls.
A few things to know if you're considering a rabbit:
#1 - A cage is NOT enough. Unlike actual "cage" animals that have a wheel to run on, a rabbit needs one of the following:
~ a cage or condo (roomier than you can buy in a store) and a minimum of 2-3 hours a day free-roam time
~ a cage or condo with an attached run (made with dog exercise pens, for example) that provides at least 60 square feet of space
OR ~ to be fully free-range (like a cat) with the help of bunny-proofing
#2 - Spaying and Neutering
Males don't need to be neutered for health reasons, but often do for behavioral reasons (they can spray pee up to 6 feet in the air and like to aim for eyeballs). Females really need to be spayed for health reasons (an unspayed female has HALF the average life-span of a spayed female). ALL rabbits need to be altered before they can be safely bonded with a second rabbit because hormones can make them crazy and volatile.
**I can not recommend enough to adopt from a shelter or rescue** Spay/neuter surgery at a vet is usually in the $200-400 range! Meanwhile, the last two rabbits I adopted cost a combined total of $45 and came already fixed.
#3 - Hay
If you don't like the idea of finding hay in the strangest of places (including in your underwear somehow), rabbits are not for you. They eat a ton of hay and it gets tracked EVERYWHERE.
#4 - Cost
Rabbits can be very expensive if you shop at a pet store. Learn to love your local feed store/livestock supply store! Hay is like $3-8 per pound from the pet store and around 8 pounds for $1 at a feed store. Kiln-dried pine pellets or paper pellet litter is maybe $10 for 20 lbs at a pet store... I pay $5.99 for 40 lbs of equine pine at the feed store. Like cats, you can easily drop $10-20 on a single toy at the pet store and, like cats, they'd rather play with something from the dollar store anyway. Our cats get hours of enjoyment out of a cheap bag of pipe cleaners and our rabbits love wiffle balls, untreated willow wreaths, hard plastic baby keys, baby spoons, stacking cups, links...
#5 - Rabbit attitude
Rabbits have a lot of attitude! Like cats, they are FULL of personality and every one is unique. We've got 5 cats and 4 rabbits and they've each got a completely different take on life. They are NOT cage pets but they ARE wonderful companions!
Some great sites to learn more about rabbit care that should cover any basics I've overlooked after a long day at work:
https://rabbit.org/faq-diet/
https://rabbit.org/suggested-vegetables-and-fruits-for-a-rabbit-diet/
https://rabbit.org/hay-in-your-bunnys-diet/
https://binkybunny.com/bunnyinfo/
https://rabbitsindoors.weebly.com/
http://www.therabbithouse.com/
https://bunnyapproved.com/indoor-rabbit-housing/
https://myhouserabbit.com/rabbit-care/housing-your-pet-rabbit-indoors/