What is Superiority Theory, Incongruity Theory, Release Theory? I couldn’t find what they mean. (This is of humor btw)

Superiority Theory is when you laugh at someone else’s expense. You are making fun of them because you feel superior to them.
Release Theory is you laugh to release nervous energy.
Incongruity Theory is a joke that a comedian would use. “The most common kind of joke is that in which we expect one thing and another is said; here our own disappointed expectation makes us laugh.”