My friend loves opening different trades at a time, most at times is difficult for him to control what's should be. Trading on free chart with multiple opening can be very dangerous. Yesterday he experience unusual hit when bitcoin price drops again, four trades loss at once when the market go against him. Personally I don't advise multiple trade especially when you're not familiar with trade
It is true that some time multiple trading can bring much profit from a single trading . And earning from multiple trading will be possible only when it is in the right hands i.e. he should have enough knowledge about trading and analyzing it. And if it is interrupted, there is a possibility of loss. I generally also don't much like multiple trading because of it's hard to maintain at a time. Any way from single one it can be also possible to get a good profit it all trade in a right track.