Colour Correction on Adjustment Layer

Hello,

You can achieve below mentioned using the adjustment layers:

• Nondestructive edits. You can try different settings and re‑edit the adjustment layer at any time. You can also reduce the effect of the adjustment by lowering the opacity of the layer.
• Selective editing. Paint on the adjustment layer’s image mask to apply an adjustment to part of an image. Later you can control which parts of the image are adjusted by re-editing the layer mask. You can vary the adjustment by painting on the mask with different tones of gray.
• Ability to apply adjustments to multiple images. Copy and paste adjustment layers between images to apply the same color and tonal adjustments.

For further info, please refer below links:

Adjustment and fill layers in Photoshop

Thanks

Prakash

An adjustment layer allows you to apply a consistent adjustment to all the clips under it, not just one.