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.
Yes I also agree that to experience some loss ( minimal loss) is a good teacher to becoming a wise trader. But of course do not make it a habit. Any loss should be compensated by another trade to recover from such loss. You should develop a your own technique when you got familiarized with the trading. Learn to distinguish indicators for the price dump and pump like reading the graph. Everything is a cycle.