NFT and cryptocollectible are gaining lot of traction recently, however the forum isnt really well adapted to them.
I believe it would be nice to have a dedicated section, lot of project are only on Discord, and i believe the NFT could bring some fresh air to the forum.
Altcoin Discussion board is there. This is a bitcoin forum after all. Altcoin projects should be humble that these (shit)coins are even allowed to be discussed about here. Still if you want to talk about them there is this section.
For buying/selling you can use the Marketplace (Altcoins) section and for discussing the services of traders use Service Discussion (Altcoins).
Again NFT is a token so the Tokens subboard may also a place to post. Note that getting a decent value reply there should not be your expectation.