Can anyone help me how to know if the bitcoin price will decrease?
and how to trade bitcoins and earn? 
Because i invest bitcoins in yobit.net but i didn't know how to properly trade bitcoins. As a trader learn all how to trade and earn bitcoin. As you can say that you made deposit in yobit now much better you to buy an altcoin for you to trade of and do search before u buy coins so that avoid losing money.