There are quite a few baseball axioms that become entrenched in your brain from watching the game for a couple decades. They don’t quite fall under the umbrella of “unwritten rules” because they have nothing to do with sportsmanship or whatever; just smart baseball. Broadcasters love to repeat them.
- Don’t make the first or last out at third base.
- Don’t try to steal when it’s late and you’re losing by more than a few runs.
- Don’t try to advance to third base on a groundball hit to the left side.
Those are just a few of many.