HSL or hue, saturation, and luminance - the critical elements of color. Kate Woodman even makes an appearance here. Using the individual elements of color within your image will allow you take complete control of your colorwork.
This is a tutorial on color grading in Lightroom, right? Why the section on black and white? Justin loves some black and white images and uses them in a lot of his work to tell a story. The absence of color is still a color choice and consideration.
Justin shoots a lot of landscapes to use as backplates in his composite images. Using the vibrance and saturation sliders are two of his go-to tools in making backgrounds pop.
Like in Lightroom's sister program, Photoshop, the curves tool/panel is an extremely powerful and useful tool. In this section, Justin breaks down how he uses the curves tool to add and subtract color in Lightroom.