KelbyOne - Mastering Curves: Adjusting Tonality

https://members.kelbyone.com/course/bwilmore_adjustingtonalitywithcurves/

Just as layers are the most powerful feature in Photoshop, curves are the most powerful adjustment. So powerful, in fact, that many adjustments you normally use (such as brightness and contrast, levels, and color balance) are actually simplified versions of curves. With that in mind, if you can master curves, you can master adjustments – and Ben Willmore will show you how.