At dusk, indoors, or when you are shooting into the light, the camera's own sensitivity is no longer enough and you need a separate burst of light. A flash can go straight into the camera's hot shoe or stand further away and be fired by a radio trigger — that is what decides how freely you can position it. The other thing to weigh up is power and the recycle time between flashes: if that is long, shooting a burst will not work.
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At dusk, indoors, or when you are shooting into the light, the camera's own sensitivity is no longer enough and you need a separate burst of light. A flash can go straight into the camera's hot shoe or stand further away and be fired by a radio trigger — that is what decides how freely you can position it. The other thing to weigh up is power and the recycle time between flashes: if that is long, shooting a burst will not work.