The best players write down the playbook for the ones coming next. Your knowledge dies if you keep it to yourself.

Knowledge kept private feels like an advantage, and briefly it is. The trouble is that it stops accumulating, since nobody adds to it and nothing survives your involvement. What gets written down and handed over becomes a base the next group builds on instead of rediscovering from the beginning.

Write down how you do the thing you are best at, in enough detail that somebody could follow it. One page is usually enough. Then give it to whoever comes after you and let them improve on it.