Psychology isnt an answer to knowing people.
It tells you what people think, how they act, but it doesnt tell you who they are.
Psychology helps you to know people better, but only if you already know them first.
---
Hey, go check it out, something rather poetic on the other side. Tell me what you think.
---
Oh, of all the endless deep psychological analysis, its not what is really needed.
What you need to know someone, is to be a friend.