Entry points are usually designated by an oscillator (RSI, CCI etc) and exit points are calculated based on a positive risk-reward ratio. Using stop level distances, traders can either equal that distance or exceed it to maintain a positive risk-reward ratio e.g. If the stop level was placed 50 pips away, the take profit level wold be set at 50 pips or more away from the entry point.
Many forex traders start with a simple trading strategy. For example, they may notice that a specific currency pair tends to rebound from a particular support or resistance level. They may then decide to add other elements that improve the accuracy of these trading signals over time. For instance, they may require that the price rebound from a specific support level by a certain percentage or number of pips.