How to gain experience (in whatever it is you do)
“Good judgment comes from experience, and experience comes from poor judgment.”—?unknown
Making mistakes. I’m not sure if there is any other way. Sure, counsel from those with experience can increase knowledge thus mitigating some mistakes, but knowledge and experience (or wisdom) are very different things.
NOTE: I didn’t make another big mistake recently, though I’m likely to do so. Just found this quote in an old book of mine.