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.
I have get into trading for a while and never lose so far, only profits.
The way is clear, invest on some potential coins, look at the price of bitcoin, ethereum, bcash, litecoin even ripple increase significantly in the last few months. If you want to trade some unfamous coins in the market or invest in an ICO, it will be risky and be ready to lose your money, unless you know how to pick some coins which has potential to rise after few months.