To know which coins are good is to check the platform of the coin. Checking and reading the platform of the coin is good because you will know if it is worth to invest with this coin and I think you will know the future of this coins if you always read. Sometime always look for the team of the coin if its reliable and a good team behind it. Always remember that you always read about the article, whitepaper and also the platform of the coin. This can help you to know and have knowledge about this coins.