By Fr. John Zuhlsdorf, OnePeterFive - The Catechism of the Catholic Church 2084 ff. elaborates what the 1st Commandment involves. Quickly, it forbids idolatry, such as the worship of any creature, and of “demons … power, pleasure, race, ancestors, the state [and] money”. Specifically prohibited: superstition, polytheism, sacrilege, atheism, and all practices of magic and sorcery, astrology, palm reading, and consulting horoscopes or mediums. Today, “graven images” could perhaps also be translated into too much attachment to a sports team.