In order to give sound advice you must have experienced whatever you are speaking on and lived through it.
If you are in your right mind, have the ability to analyze what actually occurred to determine what you could have done differently to deliver more positive results is something no text-book in the world can teach you.
Remember that text books are written by another human being.
If you haven’t experienced whatever I need advice on I am not interested in your inexperienced observations and opinions.
I never give advice on anything that I know nothing about or have not personally experienced enough to know what I am talking about.
Anything else is rubbish!