I would exclude stolen bases from this as they can be earned.
But yes, obviously walks, HBPs, errors and passed balls/wild pitches are going to kill you at higher levels.
The question is however to avoid them because kids are not intentionally botching plays.
What you probably can avoid is stuff like mental errors, unnecessary throws , sloppy blocking and also when it is better to accept a hit or run and prevent bigger damage (like first baseman leaving bag instead of trying a very risky pick at his end range.