First of all – you can buy an NFT only by using cryptocurrency.
You can’t buy it with a credit card (yet). You will also need a wallet.
Not all wallets can hold both Crypto and NFT, and not all wallets are also selling platforms.
To keep it simple –
1- You will need to open a wallet with the correct currency (ETH, SOL, MATIC, LINK, etc.)
2- You will need to connect it to the minting website or selling platform (BE CAREFUL ABOUT SCAMS!!!!)
3- Now, you can buy an NFT
[but wait and read all, so you know what you are doing]
“You will need to open a wallet with the correct currency”
Not only technical – you can buy in via a platform or, if you can get it, white-list or mint.
the benefit is that you get a better price than on the platform,
On the other hand, it means you support a project without knowing what will happen.
So eventually, if you believe in it, better to get in early.