The ultimate lesson is that very few people, even those who seem wildly successful have any idea what they are doing.

This is why narcissist and people who are overconfident to the point of absurdity often excel and business at life. No body else has any idea what they are doing, their competitors mostly have no idea what they are doing, and they are willing to project that they know what they are doing unconditionally which is attractive to many people.

So people follow them.