Most beginners dwell themselves in trying various indicators. After some time, they lose interest and try to find out a better one. It must be noted that no indicator is perfect. All indicators send out errors. It is the ability to reduce error signals that enable a trader to remain successful. For this parameter optimization is very much required. We have to change input parameters of the indicator and try it out on the demo account. The parameter that gives us the lowest error should be used. Still, another indicator would be required to filter out errors completely. This is a process followed by all professionals.