Where a fixed price is placed, all you have to do is click “Buy now” and make payment with your crypto assets. However, it is slightly trickier with auctions because you would be required to submit a bid and wait until the creator makes a choice.
On both fronts, you would have to pay a gas fee for the conclusion of the transaction, even in cases where the NFT is free. As such, whilst picking an NFT to buy, ensure that the crypto in your wallet is enough to cover both the sale price and the gas fees. After buying the NFT, it moves into your wallet, and you assume the position of an owner. Just like an initial creator, you can decide to sell an NFT that you previously purchased.