I know many monks can tell fortune (I don't know if this word is right, there is no disrespect). Is it as often as common fortune telling?

It is a continuation of a theory. After thousands of years of inheritance and verification, China's eight-character numerology of metaphysics has formed a complete set of theories, among which there may be many factions, but the eight-character numerology is the mainstream. Do you mean to learn Yi ology or metaphysics? Monks in temples learn this, and when they have nothing to do, they recite scriptures, so they will. Ordinary people are professional fortune tellers who study in their spare time except talented people like us. If you look at the history of this theory yourself, you will know, or they judge things by 66, 66 and plum blossoms, and you know the same with your own Baidu knowledge definition.