There are several options available on internet. However here are the steps on how to sell NFT art:

Create a digital wallet. You will need a digital wallet to store your NFTs and cryptocurrency. Some popular wallets include MetaMask, Coinbase Wallet, and Trust Wallet.
Choose an NFT marketplace. There are many different NFT marketplaces available, such as OpenSea, Rarible, and SuperRare. Each marketplace has its own fees and features, so it is important to choose one that is right for you.
Buy cryptocurrency. Most NFT marketplaces require you to pay in cryptocurrency, such as Ethereum or Bitcoin. You can buy cryptocurrency on many different exchanges, such as Coinbase, Binance, and Kraken.
Connect your wallet to the NFT marketplace. Once you have created a wallet and bought some cryptocurrency, you will need to connect your wallet to the NFT marketplace. This will allow you to transfer your cryptocurrency to the marketplace and start buying and selling NFTs.
Upload your NFT. Once your wallet is connected to the NFT marketplace, you can upload your NFT. You will need to provide a title, description, and price for your NFT.
Promote your NFT. Once your NFT is listed, you will need to promote it to potential buyers. You can do this by sharing it on social media, listing it on NFT directories, or joining NFT communities.
Here are some additional tips for selling NFT art:

Make sure your NFT is high quality and unique.
Set a competitive price for your NFT.
Promote your NFT on social media and NFT directories.
Be patient and persistent. It may take some time to sell your NFT.
Here are some answers to frequently asked questions about selling NFT art:

Can anyone sell an NFT? Yes, anyone can sell an NFT. All you need is an account with an NFT marketplace and a digital wallet.
How much does it cost to sell 1 NFT? The cost of selling an NFT varies depending on the NFT marketplace and the cryptocurrency you are using. However, most NFT marketplaces charge a fee of 2% to 2.5% of the sale price.
What are the risks of selling NFT art? There are a few risks associated with selling NFT art. First, the value of NFTs can fluctuate wildly, so you could end up selling your NFT for less than you paid for it. Second, there is always the risk of fraud or scams, so it is important to do your research before selling your NFT.
I hope this helps!