Questions about how to sell a bottle(not selling it here)

To be clear it am not trying to sell a bottle on this reddit. I have a friend with an old bottle of bourbon and i would like to help him sell it. I have no idea how selling alcohol works. I was just wondering how someone would go about selling an old bottle like that. It was gifted to him and he would like to sell it buy doesnt want to have to sign up for websites and all the bs that comes with selling stuff these days. Is there a reddit page for buying and selling older bottles or how is it done now days. You can't just list somthing like that on ebay and he has had it for like 2 years just sitting there.