Trading Forex is most effective, profitable, and powerful when you pay attention to whether or not there is a long-term trend or range in any currency pairs or crosses, especially the major ones; and, if so, in which direction that trend is headed. Once you have identified a trend, you should trade it in the same direction, or trade reversals from support and resistance when there is no trend. For these calls, use a higher time frame price chart, such as a weekly chart.
For the same purpose, you can also use a daily time frame chart, but you should use the weekly time frame since you can easily see the very long-term price action there. You should also use at least one shorter time frame chart to fine-tune your trade entries and exits to make them more precise, which also means more profitable.