There are a range of adjustments which can be applied to your design as a new layer for corrective or creative purposes.
Adjustments are applied from the Adjustments panel and most include customisable settings alongside general adjustment options. Once applied, they can be identified as both an adjustment and a specific adjustment type by using unique symbols.
Adjustment layers only affect layers which are below them. Alternatively, you can make an adjustment a child of a layer (or layer group), thereby affecting that layer (or layer group) only.
Some adjustments (i.e., Curves, Levels, or Channel Mixer) can be made in any colour space independently of the document colour space.
The following are available from all adjustment general settings:
The adjustment is added directly above the selected layer, or at the top of the stack if no layer was selected.
The preset will be saved in the Adjustments panel along with other adjustments of that type.