Learn the basics of reading people

Detect a person’s communication style.
During a conversation or a disagreement with someone, observe your interlocutor’s communication style. Determine whether they are assertive, aggressive, passive-aggressive, or manipulative. Deliver your message accurately, considering their style.

Get to know other people's cultural backgrounds.
A person's culture can teach you a lot about them if you really want to know them. Find more about their traditions, rituals, beliefs, and values because these are the roots of their personality and behavior.