What can you do with a bank account, a book you wrote, a patent you own, an image you shot? Immaterial objects and intellectual property is not new. And NFTs are not that innovative or special in that regard.
All of those examples are backed by the state, who has the authority and power to investigate, litigate, fine, and arrest those who violate their rules. NFTs don't provide that. There's just the promise that, eventually, people will respect other people's NFT ownership... for some reason.
The laws of the country you live in have answers to those questions. Usually, you are the only person legally allowed to use your bank account. Nobody else is legally allowed to publish your book under their name, etc. There are no laws protecting "ownership" of NFTs