Bitcoin is the leader of the cryptocurrencies. It's price has influence over every alt-coin. Cryptos have limited real life applications so far. Basically they are being used for profit earning only. There is a simple rule-buy when the price is low and sell when the price is high. But do people realize who are affected by this speculation? Is someone's gain is not somebody else's loss? The big players know it. They plant fake news and change the sentiment of the market as per their interest. An ordinary investor becomes fool and cheated.