Trading has been one way of making profits from time immemorial. Buying bitcoin at a low price and selling it when the price increases is one of the superb way to make profits. Trust me.
But you can not know in advance how the price will behave. I think that in order to engage in trading it is necessary to study its market well and to know its patterns. This will not help you to know the price in advance, but you will be able to determine the existing trends.