Quick Tip (Mac OS X)

Most Mac users should know the key combination of Command+Tab keys will bring up the Application Switcher in the middle of the screen and you can choose and switch between applications by clicking the Tab key while holding the Command key. By just clicking Command+Tab keys once will switch between two applications you use last.

But do you know that, by clicking Command+~(Tilde, the key just above the Tab key) you can switch between windows/documents within the same application. This comes handy if you have multiple documents open up in Indesign or multiple windows open in Firefox or Safari.

However, watch out for some exceptions like Adobe Photoshop, the key combination is Control+Tab keys instead of Command+~ to switch between opened documents.