I didn't ask about how to be a billionaire or on how to start innovative companies, I am asking to to actually use different careers altogether to make it more

I didn't ask about how to be a billionaire or on how to start innovative companies, I am asking to to actually use different careers altogether to make it more useful. Elon Musk has in-depth knowledge in physics, economics, computers, coding and obviously business, a few were a degree course too