What is Aristotle's theory of virtues?

All I remember about Aristotle and his theory on virtues is that he believed that "a virtue is a mean between two extremes in which they are both vises", meaning that you don't do too much of something, but that you don't do too little either. for example you don't drink too much that you are a alcoholic, but that you don't drink at all when you are thirsting over alcohol all day.good luck with your paper! :D