It is so impossible to trade without any single loss. But the thing is we can compensate every loss thru average down. So do not trade the whole money 100%. Always trade in portion. One more thing do not trade using margin if you dont know how to manage it.
Yeah, its impossible but having a technic with trading will less your profit loss. Some of succesful traders base on the news of the coin. When good news comes from a coin the traders are raising their buy orders then just wait for a more than 5% profit in that coin. Some traders lose because they expect too much because the movement of cryptomarket is so volatile it will burn your profit in every second.
Stop loss is part of the technique. Sometimes, even when you put up all the techniques together, some factors can just change the market immediately.
For example, bitcoin starting a bull run is something that can cause your technique to fail you and if you do not make use of your stop loss in cases like this, you may just end up accruing huge losses to the point that you just have to use the patient method which could take months before you get your profit from the trade.