"Here is what better advice looks like: don't buy/sell any securities unless you, personally, know exactly how and why you're going to profit from it."

For people like Warren Buffett, that's his full-time job—figuring out how and why he is going to profit.

Me? I'm not going to know shit, so I will "3. Never buy or sell an individual security."

"…save your money and invest in one or more proven, profitable, Great Depression-proof businesses that pay you a dividend"

Besides the obvious (that this is not really saving money if you are in fact investing it) I'm curious where the safe harbors were during the Great Depression. I've asked before and have not received an answer.