Somebody gave you a hand up. Pass it on. That’s how one kindness lasts for decades.

Help tends to travel forward rather than back. You usually cannot repay the person who gave you a boost in the same form they gave it, but you can hand that thing to somebody standing where you were standing. That is how one act from years ago is still working.

Find somebody a year or two behind you and give them what you wish you had been given, a tip, an introduction, ten minutes of explaining. Do not make them ask twice.