Global HSL adjustments aren’t very useful. If you shift the global hue of an image it quickly looks wrong. The real strength of the HSL system is the way it lets you separate and edit individual colors.
A way of adjusting the colours in an image – the Hue adjustment shifts the colour along a continuous spectrum, while the Saturation adjustment changes its intensity. For example, you can shift the hue of leaves away from yellow towards blue and increase their saturation to make the leaves look ‘fresher’.