as a beginner in bitcoin no body knows how to sell or how to buy bitcoin.some time later they find the site on google but no body knows this site is right or wrong .often on social media you will see a link saying something like buy bitcoin for 10% under market value. this is a marketing trick to get you to visit and use their fake exchange .
one day if you visit any exchange site the first thing you want to know make sure it's HTTPS secured and not HTTP. this means that the web site is encrypted and secured. if it's only HTTP without the "s" that is a big red sign and means stay away from them.
thanks for upvote me