Functional psychology. Please read some of good literature available for the subject. Do not learn by text books.

You will thank me later. Your most important possession is your mind. Protect it from hunters and hackers. I support mind games but only to get your love.

Start with Art of seduction, then Influence and many more. Everything is mind game unless you understand it.

You will get very small nuggets of wisdom from each book. Apply them and make your own rule-book based on your personality and experience. I guarantee that your life shall be 10X easier and productive.

How do you know if someone is worth your time or not?