About diversification........................

“Students learn corporate finance at business schools. They are taught that the whole secret is diversification. But the exact rule is the opposite. The ‘know-nothing’ investor should practice diversification, but it is crazy if you are an expert. The goal of investment is to find situations where it is safe not to diversify. If you only put 20% into the opportunity of a life-time, you are not being rational. Very seldom do we get to buy as much of any good idea as we would like to.”

-Charlie Munger, as quoted here