NFT trading is about the same process as trading with another cryptocurrency, there are just some features and you see beautiful pictures (not always). In any case, I started with the NFT platform https://artozo.com/ , it is the easiest to understand because of the friendly interface. Besides that, there are some guides there, although I don't think you need them. To be honest, I don’t know why you get into the NFT, as for me, you can raise much more on another crypt)