Day trading has a lot of risks if compared against mid-range or long term trading. We can't predict the price for short term as even after we buy the coin, it might start dumping and in such situation we might always need to hold the coin until we see it rising again. Day trading is meant for extremely volatile coins with high trading volume. Research is always needed if we tend to have profits. Investing randomly in any of the coin for day trading will only give loss.
Though we consider that it there is a lot of risk but we are gaining much than for a long term trader that's because the price keep moving and every single fluctuations we usually take advantage on it. Long term trader is safe for possible losses but we don't know if that certain coin will move high than of your buying price not unless for Bitcoin and some potential altcoins.