How Warren Buffet made billions from real estate investing

Everyone knows that Warren Buffet is the second richest man in the world with an estimated net worth of $40 billion. But not everyone knows how he made his billions. Buffett is unique among the world's billionaires because he gained his wealth exclusively through investing, instead of starting or owning a single company or having an invention.
So where did he make all his bucks? According to Adam J Davis, you can say that he is a real estate investing wizard because many of his investments are quite real estate dependent. He owns one of the largest real estate brokerages in America, along with building supply businesses.
Davis has been a student of Warren Buffet for many years and he had dug up some very interesting facts, such as how Buffet started his investing business, who were his initial partners, what were his strategies, etc. In this writeup, the guy gives a pretty good picture of who Warren Buffet is and how he amassed his billions.