Go to beta.openzeta.io and find your favorite NFTs, or browse the popular collections.
To interact with the blockchain data, you need to connect one of the supported wallets.
You just need to press the "Buy" button and pay, and you are done! The NFT will be transferred to you.
Each collection you create is a TNT721 smart contract deployed to the Theta blockchain.
You can create your own NFTs by selecting your collection and adding information about your art.
Once you have an NFT, you can put it for sell on the OpenZeta marketplace and wait for someone to buy it.
Connect your wallet and submit the NFT contract address, OpenZeta will take care of the rest.
You'll see your NFT listed on your profile page, and you can list it for sale like any other NFT.