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 ? 
You must know yourself. You must know what is your heating point. We all know that trading is very complicated job. We can lose our money if we can't control our emotions. You should focus first to how will you improve your self when you are doing trading.