Do your own research and don't just rely on only one article that said that the prices of the said coins will be good. Do your own research on each coin and also, how do you know that this coin will yield a good profit margin, what's the basis for that, what's your evidence? There should be an evidence right?
Long term investment is good especially when we choose which or what would you invest and where to put our hard earn money, and the best way is to manage properly your investment for the sake of your future and learn to listen, attend some investment lectures to gain more knowledge in investing to make it profitable.