Why is there a word fortune telling in the world? Live or die?

There is a kind of learning in China, which is called Yi Xue, or calligraphy. I read a book about fortune telling a long time ago, and there is a school. Fortune telling is not a matter of calculating life and death. These fortune tellers will simply do physiognomy, get a little information from your expression and behavior, get the information you want from your speech, then try to guess first, and then judge right and wrong from your expression, so as to further scrutinize, probably.