DON'T sit down until told where to sit before eating.
DON'T begin eating until the host starts.
DON'T put your elbows on the table, but do keep your hands above the table.
DO compliment the chef by asking for seconds.
DO finish everything on your plate.
DO give a toast if you are the host or the guest of honor. The host gives the first toast, and the guest of honor returns the toast later.
DO put your fork and knife parallel on your plate with the handles facing to the right to indicate that you are done eating.
DO share your food with your dining partners. They will likely do the same.
DO keep your wine glass at least half full when you no longer want anymore wine.