Shortcuts are an important and effective way to speed up and enhance your designs with Revit. Not only will they save you a lot of time when using them effectively, but will also create a much smoother and enjoyable experience for the user. If you are not already familiar with the shortcuts, in my opinion the best way to learn them is just through using the software, and taking note when selecting tools to use in your ribbon. (If set, Revit will notify you of the shortcut command of each tool on the ribbon.)