The idea behind trading is very simple, you just buy low and sell high. You clearly don't know anything for sure but to predict, you just need to follow the news regarding that specific coin (a hard fork, an update, being added to an exchange, merchants accepting it etc.) all these factors play a big role in determining the price. Another way would be to buy CryptoPing BOT subscription, It has the ability to predict based on the increase on volume etc.
But how do you "find" a coin to research, as in where and how do you pick a coin to look in to?