True story about unsolicited advice given to me not on a golf course. I was standing at the counter of a local convenience store with a few items in hand and I ordered a few quick pick Power Ball tickets (jackpot was way way up there at the time). Random guy behind me pipes up...says something about how I'm throwing my money away yada yada yada...I paused for a moment and paid for my purchase then turned around and thanked him for his advice. Then I asked if he had a business card or something with his personal phone number. He asked why I wanted his phone number. I said: "because the next time I get the impulse to spend my own money on something I would like to call you to get advice on whether or not it's a good idea"
Random guy face turned red - clerk and other people started snickering about it...he shook his head no I turned and walked out to my car.

don't EVER offer unsolicited advice unless or until the other persons words, actions or behavior interferes with: A)your own serenity B) the line of your putt C) crosses your threshold for utter stupidity.

I always tell people what they're doing wrong on the golf course because I am an authority. Same in real life. I am an authority. Simple as that.

Sometimes people don't explicitly ask for advise, but sometimes they ask by body language or short comments. But yes, it's best to be quiet if you do not know what you are talking about.

Free advice can often be worth what you paid for it.