Sold a few things on there over the years. Far bigger audience that CL so that is an upside.

Best to get the items packaged and weighed first otherwise if the shipping doesn't come out right you'll have to eat it.

Super accurate descriptions and quality pictures are good to stay out of trouble. If the item has even small flaws let them know.

Once something is shipped I send the buyer a message and let them know it's headed their way.