It is extremely important that when you get into investing within the cryptocurrency field that you diversify your investment. It is natural but when you see a single coin increasing in its value that you tend to want to buy as much as possible of the coin for future increases that it may experience. However the cryptocurrency world is very volatile and a coin is increasing in value can drop steadily in its value or significantly and its value within the space of a few hours. Therefore it is not advisable to put all of your eggs in one basket in the sense that your entire investment goes into a single coin.
I recommend that you invest in various different coins that do have a promising future, so that if a single coin drops in its value you are able to make up for that drop by any increases in the other coins that you may be holding at that time. In this way you are able to manage the losses that you make and you are also invested in different coins which could lead to much higher future profits if you have chosen the coins correctly.