People who have studied psychology only know more about the psychology represented by a person's behavior to a certain extent, and many people's behavior language is not inherent.
So many people will not only have simple psychology.
It can only be said that psychology only represents the psychology of most people, not all.
So psychology only studies most psychology, and there are also psychological reasons.
It can't be said that learning psychology will give you a better insight into other people's psychology.
I hope my answer can help you.