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
Do you mean futures? If yes, I don't recommend futures as well it will make your investment gone in a seconds. Futures needed to be set according to your thing I mean it is better to set it in isolated with small multiplier only but then you can advice him to stop for awhile and make some research about how to futures and trades so he will not lose too much because it will be a regret of him soon.
Opening several trades in a row was already risky but when you add leverage on top of that then the risk becomes too high for anyone to manage, as a trader could be the very best in the world with a strategy which wins 99% of the time with fantastic profits on each trade, and yet given enough time such a trader will go bankrupt anyway.
This show us that despite our level of skill, risk management is critical, and someone which disregards it will not last long on a market which is as volatile as this one.