Basically, if a bunny stays still and accepts the pets, then you’re good! They will leave if they don’t want to be touched. Also, bunnies all like to be petted in different ways. Hannah loves for me to touch her head and I can smush her fur around, play with her ears, touch her cheeks, etc and she loves it all. However, the second I touch her back she seems a little nervous and I have to start petting her head again. Otto doesn’t like pets in general and will hop away, or shove my hand away from himself with his nose (he’s even put his teeth on me, without biting down, to tell me to get lost). When he does let me pet him, it’s almost always on his back and he gets fussy if I touch his head. They’re all unique!
I’ve found that neither of my bunnies (or most others I’ve met) like to be touched under the chin, on the tummy, on the feet, or on the tail. I’m sure there are bunnies that don’t mind it, but those are the general zones to avoid unless you know your bunny enjoys it.