They love Opuntia (Prickly Pear) Cactus pads! Best to avoid or at least limit plant matter in the Brassica family (kale, cabbage, etc.) because it can cause bloat which can be deadly. But they will eat it and they love all veggies! I think you're supposed to dust the veggies with calcium powder for reptiles. And of course they need the heat light and UV light that all reptiles do.
They need a good soaking in warm water every week or so. They'll drink from it and also usually have a very impressive poo while they're in it! It's gross and you'll wonder how it fit inside that little body, but I don't want you to be surprised