The Library module not only contains all the tools for organizing, categorizing, and sorting your photos, it also includes some quick develop tools. You can use these tools to easily judge the editing possibilities and quality of your photos without going into the full Develop module.
Understanding the Histogram
Alter the Photo with a Preset
Crop Your Photo with a Preset
Make a Quick Change to Grayscale
Quickly Select a Different White Balance
Fine Tune the White Balance Setting
Modify an Auto Tone Change
Understanding Library Module Clarity and Vibrance Tools
Improve the Photo with Clarity and Vibrance ...