Visually, Parabolic SAR is a series of points that are located under or above the graph. The dots indicate whether the price of the asset is rising or falling.
This line of points has a period of 0.02. It was calculated and used by the creator of the indicator, so it is recommended to use this value.
If you increase the period, the Parabolic SAR will give more signals, but many of them will be false. If you reduce the period, the indicator signals will become more accurate, but their number will decrease.