You can turn your digital art, photos, or drawings into NFTs on OpenSea. If you use photo editing apps like Photoshop, it's easy to create digital art that you can turn into NFTs. Before you can list your NFTs for sale, you have to pay a fee (usually called gas) for minting your NFT on the blockchain. Ethereum has high fees, so if you use Ethereum blockchain for minting NFTs, you will be paying a lot. Solana or Polygon have lower gas fees.