What's the best advice you've learned though your time on Earth (as opposed to the moon)?

Love is a verb. Someone told me this years ago and it stuck. You can apply it in the most literal sense in your romantic relationships, familial, and friendships. You can also use the less mushy (and inverse) version “Watch their feet, not their mouthes” in working relationships and more casual acquaintances. The point is, prioritize demonstrating your care for others over expressing it verbally, and evaluate others’ care for you (or for a project, solving a problem, etc.) based on their actual efforts instead of what they say.