Photoshop in 60 Seconds: How to Use Adjustment Layers
Photoshop in 60 Seconds series, in which you can learn a Photoshop skill, feature, or technique in just a minute! The hallmark of non-destructive editing, Adjustment Layers really do have all the power of Image Adjustments mixed with the convenience and benefits of Photoshop layers. Want to see how they work? It only takes a minute!
Source: Photoshop in 60 Seconds: How to Use Adjustment Layers