Quickly Switch Between Apps
Using your mouse to switch between apps can take time away from your day. Believe it or not, using this keyboard shortcut can really increase your productivity.
To switch between apps, you need to press and hold the Command + Tab keys. A small window will pop up to show you all the apps you have open. You can keep pressing the Tab key while holding down Command to select the app you want.
As an added bonus, quickly pressing and releasing Command + Tab will immediately switch to the last app you had open, so you can use this to quickly pop back and forth between two apps when referencing information or copying text.