You should see about getting your hair cut.
see something in sth / sb: to believe that someone or something has a particular quality
I can't understand what you see in her.
see sb off: to go to the place that someone is leaving from in order to say goodbye to them.
My parents came to the airport to see me off.
see sb out: to take someone to the door of a room or building when they are leaving
Don't worry. I will see myself out.
see through sb / sth: to understand that somebody is trying to deceive you.
Don't worry! I will see to everything when you are away.