Kindly direct me on how to connect fuse and relay of the headlamps ?

while i know that power from the battery passes through the 40- 15 Amps up to the switch,tell me what happens if the lights are dim or high,in terms of relay/ fuse use.does it mean low lights have their own control and highlights too?So how many relays and fuses are put to use during high and when in low?
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