A to Z Challenge 2018: G
Good begets good.
Feeling down? Hold the door for the lady behind you juggling three bags and a toddler. Instant mood boast. Putting good out into the world makes you feel good. Hold doors, smile at people you interact with, say hello or good morning. Wave to small children.
You don't need to know how those actions effect other people (they won't hurt them) only how they effect you.