If you use Adobe Photoshop Lightroom a lot then you can speed up your workflow significantly by becoming familiar with the shortcuts for commonly used actions. Bookmark this page for reference.
If you want to take things to the next level you can create your own shortcuts. Some commonly used actions do not have a shortcut assigned by default such as 'Build 1:1 previews'. To do this the Photographers Toolbox have created a plugin called Keyboard Tamer. In return they ask for a donation amount of your choice. If you are a committed shortcut user then we highly recommend this plugin.