This is the basic formula for making a profit in every investment. What you have to do is, buy coins at a lower price and after a certain time later when the price of the coin is starting to gaining then sell it and generate profit from it.
more precisely it can be said that way is a simple enough strategy to be able to make a profit, but although it is simple there are still many people having difficulty applying the trading strategy, because every price they want to go up is decreasing they will panic and sell it at a low price .