There's actually a free, online UC Berkeley course you can sign up for which aims to teach the science behind happiness and positive psychology and how you can use these concepts in your life:
The Science of Happiness
I figured The Haven is an appropriate place for this since it's where so many of us come when we're unhappy, and this is a legit, totally free course being offered by a top-tier University on the science behind being happy and how to apply that science to our lives.