Is the palm credible? Is the lifeline credible?

A person's fate depends on his personality, which is formed by the environment and related to his own physique, but palm reading is really unreliable. I met a famous Zhang before. Even he said that he was actually a fortune teller, but he couldn't predict a person. He just put forward a few hypotheses. Maybe someone just responded to the hypothesis, which is a coincidence. When he reads Fortune to others, he mostly reads it, implying that the people he listens to are just entertaining.