There are several things to learn in trading. You need to know how to distinguish good coins from not because when you say "trading", you are talking about risking your money or whatever you initially have for something that you think is worthwhile. It is an advantage if you can understand price charts. That'll guide you in your decisions. Why do you need to know the coins to choose in the first place? That is to avoid panic selling. When times come that your chosen coin did not turn it into what you guessed it would be, panic selling would be very likely to happen and you won't want that. So better yet, choose a good coin to buy at first to avoid this from happening.