Why do fortune tellers look at eight different characters?

There are both good and bad aspects in the eight characters. Just like people, their surfaces are bright and their insides are mostly filthy. Different perspectives on life will lead to different views, different levels and different fortune-telling. In addition, feng shui, yin virtue, reading and acquired environment have different influences, youth and aging are different, and even different opinions. But fate and good luck are all the same.