What is a life hack that you think everybody should know?

There is a thing that everybody knows but almost no one does it.

Try to think before you say something. I know that it sounds stupid. But how many times have you answered with “fine” when someone asked you “hey, how are you”. How many times you said something and then you thought all the way home that you shouldn't have said that. Listen, that second before you tell something makes the damn difference. The difference between and impulse answer and a processed answer. Just try it!