Befe you buy anything, you need to look at where the price of the coin is heading, use RSI and Bollinger bands. Impulsive buying in trading is dangerous. You need to study the trend first. Also plan your exit, what will be your planned profits before selling. If you aim too high, it might take quite some time before you hit your goal, but if you aim too low, it might be achievable but you will not feel your profits because its too small.