Is it true or not to calculate the eight characters?

Something to see,

Some fortune tellers learn by reason, so they can be trusted because they are passed down from generation to generation. Just like our profession, they use special methods to reason and predict, but some fortune tellers are unreliable and cheat money without real basis and methods.

Some people may say that fortune tellers don't count for themselves, so that they can get rich and become officials. Actually, fortune tellers have rules. Doesn't mean they can show themselves. Perhaps this will violate the ancient fortune-telling rules, only for people, not for themselves. Some fortune tellers can calculate so accurately, even if they guess, can they guess so accurately every time? Why do people still believe it? No one knows whether the fortune-telling spread from ancient times to the present 3000 years ago is true or not.