The tone curve is easily one of the most useful and versatile tools for editing your images, and its power extends far beyond simply editing the light and shadow in your images. If you need to learn more about how to use it for your own work, this great video will get you up and running in no time.
Coming to you from Nigel Danson, this helpful video will show you how to use the tone curve in Lightroom. The tone curve might seem a bit strange compared to the sliders in Lightroom, but it contains in it a range of powerful adjustment capabilities. The tone curve is a graphical representation of input and output luminance values, where the horizontal axis contains all the luminance values already in your photo and the vertical axis represents the values to which you would like to map them. This allows you to quickly and intuitively change brightness and contrast in your image. Furthermore, by switching to the tone curves on individual color channels, you also have a powerful tool for color grading your images. Check out the video above for the full rundown from Danson.
If you want to continue learning about Lightroom, be sure to check out "Fstoppers Introduction to Adobe Lightroom: The Ultimate Crash Course With Pye Jirsa!"