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
You have said it all that multiple trade is not advisable when you're a newbie to trading, this does not applies to trading bitcoin alone, but any other thing in life, we shouldn't risk doing things if we are inexperienced, but when you're good at doing it, it gives you upper edge to earn more than opening a single trade, know that everything has merits and demerit side of it, if the bitcoin price is going dip, that is when some traders are making their own cool money, this is all about the leverage position you took together with your kind of trading pattern.