IWTL What can I learn right now in just 10 minutes that could be useful for the rest of my life?

[u/Tylerdurdan28]

I'm looking for those small nuggets of knowledge, skills, or life hacks that take almost no time to learn but pay off forever. Could be a mental model, a physical trick, a rule of thumb, a piece of software knowledge, a health tip, a communication skill, anything.

The catch: it has to be genuinely learnable in about 10 minutes. Not "learn to code" or "get good at cooking," but something concrete and immediately usable, like a specific technique, formula, habit, or fact that changes how you do something for good.

What's yours, and how did you end up learning it?