If you're looking to post about a Bitcoin-related NFT project, the most appropriate sub-forum on Bitcointalk would be the "Alternate cryptocurrencies" or "Altcoins" sub-forum. These sub-forums focus on discussions about cryptocurrencies other than Bitcoin, including NFTs and other blockchain-based tokens. However, it's always a good idea to read the forum rules and guidelines before posting to ensure that your post is appropriate and follows the forum's guidelines.