NFTs typically only have one owner at a time (we’ll go into fractional ownership another time). An owner of the NFT is assigned through the minting process and this ownership can then be transferred when the asset is sold. Information about who has bought and sold the asset will remain on the blockchain, meaning the provenance of the asset will always be visible.
As an artist, you still own the copyrights to your artwork after you have sold the work, as well as the rights of reproduction and adaptation unless you have stated otherwise. In the same way as physical work, the copyrights can be sold or assigned to someone else. You will still be entitled to royalties each time the work is sold.