The Adjustment Tool Tab has a number of tools to help you manage the colors and exposure of your images.
The Layers tool near the top lets you make localized adjustments with masks.
Available color tools allow you to adjust color groups, specific colors, and skin tones. The Black and White tool allows you to adjust individual tonal channels.
The exposure tools provide basic (such as Exposure Compensation) and advanced (such as High Dynamic Range) controls that impact the image, including Levels and Curves.
For more detailed information about individual tools, click the Action button (...) next to the Tool title and click the Online Help option.