I think the aspect he offers to someone that wants to stay at the job but do some remotely is still very applicable to today's WFH situation.

The Parkinson's law and 80/20 rule are great. I think more could be written about that idea of a FAQ that is maintained by customer service. This could be more broadly applicable to any documentation or how to material both internal and external to a company. Knowledge management is not an easy task.

> selling supplements of questionable benefit

Any sources? i tried to google but i'm only finding stuff about the supplements he takes, nothing about history of selling them himself.

Read the book if you haven’t, it’s all in there. You’ll get much more benefit than finding out about the supplements I suspect. I recall something about him introducing himself to people as a drug dealer when asked what he did for a living.

Like the others have said, it's not a secret: it's in his book. He didn't even own the supplement company or anything; he was just a dropshipper.

I believe this was heavily referenced in his original 4-hour work week book, where he describes his early businesses.