How to buy NFT？
In order to buy an NFT, you'll need a crypto wallet and cryptocurrency (or, in some cases, just a credit or debit card). On the formal NFT trading platform, you can buy items listed for sale instantly, bid in auctions, or make offers on any NFTs.
This is a detailed tutorial on how to purchase NFT from opensea, the world's largest NFT trading platform.
https://opensea.io/learn/nft/what-are-nfts