Apparently Etsy is the most common now, but I have sold a lot of mine on Ebay. In addition, I sold much of my artwork at a local consignment retail shop. They charged me 40% but I still made good profits without doing the work. I took a class similar to the one below that was offered by the University of Washington back in the 1990s, and learned a lot about how to market and exhibit, with some valuable resources. A fellow artist friend likes to exhibit at local coffee shops with contact information and finds buyers that way.
https://ce.seattlecentral.edu/catego...g-your-artwork