I am starting trading some month ago.Bought some alta coin but now all alta coin are down and i donot understad what can i do?I get a big lose if i sell this.So how control my mind ? 
If you want to control you emotion you must follow some strategy that is very simple at first you set you mind, you must daily trade only 10 time if you win a day 3-4 time you don't start trade on this day because you make a profit if you lose 1-4 trade you don't trade but if you 1 trade win and one lose again 1 win and 1 lose in this time you must trade only 10 trade, never trade more then 10 in a day. we really can't say when the ups or downs will occur, but as long as we have our own setup and strategy we will not be worried in anyhow
its always good to understand everything before starting to deal with trading.