Thank you all for your responses, I really appreciate.
I've only traded on OpenSea and stopped after offloading some NFTs I was holding. I have no experience on the rest.
I will be looking forward to be trading my NFTs on openSea, I just completed the research on openSea marketplace and it's really impressing. I still have one more question to ask, don't know if the question is meaningful, How long does it take for an Art to execute? I mean for someone to buy.