My father's 80/20 rule to parenting (Un-edited)

My father once gave a piece of parenting advice that has always stuck with me. His advice was to ignore 80% of what your children do wrong and admonish the important 20%.

He said not to be one of those parents that always tell his children "not to do that, be quiet, don't pick that up, etc"

But for the 20% that matters, not to budge. You need to figure out what those non-negotiables are?

For me, its lying, disrespecting parents or elders, etc.