Secondly, he is one of the best investors in the world and he enjoys checking the numbers, not many people could check the accounts of a company and understand what they are looking at. He was capable of doing that, he checked every single one, and with his early money he got into insurance which is basically "get money from people, use that to invest, make profit, try to never pay people their insurance claims" and that's how he got rich.
Could we do the same? Yes but not at that scale, you may not be a billionaire but if I was given the same chances in life (senator father, early financial education, millions of dollars from family and friends) then I would do fine as well.