If you press down the Option key while clicking on a menu, many different apps (including the Finder) will reveal hidden features, or shortcuts to existing ones.
For example, if you click on the Apple menu, the first option is About this Mac, which shows a window with some info on your computer, and also a More Info… button that opens the System Information app. However if you hold down the Option key, instead of About this Mac, you get System Information… directly. Cool!
Similarly at the bottom of the Apple menu, the Log Out username… option becomes simply Log Out username —what’s the difference? Without the … in there, that means it’ll just log you out, no questions asked. This can save a few clicks along the way.
What other shortcuts can you find?