The huge drop of coins in recent days

Actually, there could be many reasons why the cryptocurrency have drop dramatically during past 2-3 days. One tells it could be due to the coinbase website which announce the ethereum to 12 USD, or any other reasons.
What, in fact, capture my interest is that by any fluctuation of the coins, arise or drop, some body will become millionaire somewhere, since many normal people will loose some money. The important point is that, regardless of arise and drop, to be too smart to gain more and more money with any of these fluctuations.
Thus, at the end, I believe being knowledgeable , and avoid panic in harsh situation can be the keys to get rich!