Hey! I can gladly help you in this direction!
I will leave you a link to fill in the contact information. In the "comments" you can leave all your questions and you will receive an answer to your email address!
NFT is a Non-Fungible token. NFTs can be auctioned but not offline. It is digitally auctioned as it is a digital entity. It can be in form of images, videos, gifs, etc. You can research it through youtube and google.