As a basic rule, what lights of a motor vehicle must be turned on when driving in darkness?

In Germany, when driving in darkness, the law requires you to use the dipped headlight (low beam). This is because the dipped headlights provide sufficient illumination of the road ahead without dazzling other drivers. Using only the parking light is not allowed for driving because it does not provide enough visibility. Using the driving beam (high beam) is only permitted when there is no oncoming traffic or vehicles ahead, as it can blind other drivers. Therefore, the dipped headlight is the mandatory and correct light to use for general driving in darkness.