If you want to have a chance of being profitable in the currency market you will need to learn to identify the trend and trade with the trend. People fighting the trend and trying to pick tops and bottoms of movements lose a great deal of money. They will look at the market and think that it has gone up or down far enough then enter a trade based on historical information.
A trend is in place for a reason: most traders think it will go in a direction so that is why it goes in that particular direction. The trades are causing the currency to move in a certain way by the way they place their orders. If more traders are placing buy orders the price will go up until the traders that are selling have sold all the currency they have then the market will turn and do down because more people are selling and the buyers willing to get out of the market. It is a back and forth market which causes trends and reversals. The patterns are human nature patterns; by close observation the patterns are repeated over and over time after time on all time frames.