Learn new things. Why? It makes you feel good.
“The human brain long ago evolved a mechanism for rewarding us when we encountered new information: a little shot of dopamine in the brain each time we learned something new. Across evolutionary history, compulsively seeking information was adaptive behavior.”
The more you learn new things, the more dopamine nerve cells secret in your brain. When dopamine secrets more, the more you feel good.
So if you want to feel good, learn something new.