A “folly” means a “mistake”. Plain and simple.
Follies are things that all of us commit every day…well, almost. Sometimes a folly happens and we don’t even know it. It may be as simple as forgetting to do a daily chore or giving your grandmother the wrong pill after lunch. Whatever it is, follies do make us improve ourselves, if we recognize their presence, that is; and ultimately help us better ourselves with each passing day so that we do not commit that same mistake, error or wrong again!
I do not think there is any such thing as a ‘big’ folly. Follies usually refer to small or tiny mistakes that do not cause any major harm to others, but they are mistakes nonetheless and must be corrected or apologized for.
…Sorry for any follies that I might have made while writing this piece!