Teach the kid below you what took you a year to figure out. That’s how you pay rent on what you learned.

Everything you know came from somewhere, and most of it arrived slowly and awkwardly through a year of getting things wrong. Handing that to the person behind you costs you an afternoon and saves them months. It also finishes your own learning, since explaining something is where you find out which parts you actually understand. Holding it back protects nothing worth protecting.

Find the newer person on your team, in your class, or at your job and give them the one thing you wish someone had told you. Be specific and practical rather than encouraging.