The easiest way to choose good coins is to refer to the January 2018 price charts and see how the price has changed today. We can assume that the price of the coin in January is a potential growth. Thus, it is possible to earn on these coins in the future thanks to patience.
yes, it is true that by observing the graph from the beginning of 2018 we can analyze it for our hold or not. if I add what I think is potential that is ETH, RIPPLE, NEO, DASH with their quality and position in marketcurrency becoming popular and much in demand by investors.