The Color Picker tool is one of the most fundamental and important features in Photoshop, and it's packed densely with information and options. This helpful tutorial will show you the ins and outs of the tool and how to understand everything it offers and tells you.
Coming to you from Blake Rudis of f64 Academy, this great video will introduce you to the properties of the Color Picker tool in Photoshop. The Color Picker does exactly what it sounds like, but it offers a wide palette of features and methods for dialing in the exact color, saturation, and brightness you desire, and it's important to know how the different methods work to best suit your workflow and needs. Here's an additional tip: when the dialog box is open and you mouse outside it, you'll notice the mouse becomes an eyedropper tool that allows you to select any color from the open document. If you're trying to match something like skin tone, change the sample size from "point sample" to something like "5 by 5 average." This will help to ensure you get the color you want in case you click on something like a pore or small blemish.