THOU SHALT NOT give another player golf lessons on the course (If they don't know it by now, your advice is not going to correct it here).
THOU SHALT obey all course dress codes.
THOU SHALT play ready golf at all times regardless of who is away when your group agrees to this before teeing off.
THOU SHALT NOT look for lost balls if they are of less than driving range quality.
THOU SHALT NOT hit a practice shot with a second ball while others wait to hit behind you.
THOU SHALT NOT mark thy score by the green.
THOU SHALT NOT linger and waste time at the turn.
THOU SHALT NOT use a cell phone on the course.
THOU SHALT NOT throw clubs, curse loudly, or commit any other form of questionable behavior on the course.
THOU SHALT Have Fun and Enjoy the Day!
Even though these 10 Commandments are a little light hearted. It is important to remember to be courteous to other as you would have them be courteous to you.