<Source: Revised from Anglican Church Singapore Mental Rehabilitation Centre Courses.>
Below are my own Cstan98 study notes. Not mean to replace actual course.
Play people. Don't get played.
Confucius: "do not do to others. What you do not want others to do to you."
JESUS CHRIST: "do to others. What you want others to do to you."
Know other people thoughts.
'Mastermind, IQ Game'. Know source codes of people.
Think from other people perspectives.
Empathy make you more friends. Less enemies.
Able to read logics of others.
Know enough psychology to understand human nature/thinkings.
Sun Zi: "know people + self = 100% of wars win."