Cut, copy, paste, and other common shortcuts
Cut: Remove the selected item and copy it to the Clipboard.
Copy the selected item to the Clipboard. This also works for files in the Finder.
Paste the contents of the Clipboard into the current document or app. This also works for files in the Finder.
Undo the previous command. You can then press Command-Shift-Z to Redo, reversing the undo command. In some apps, you can undo and redo multiple commands.
Select All items.
Find: Open a Find window, or find items in a document.
Find Again: Find the next occurrence of the item previously found. To find the previous occurrence, press Command-Shift-G.
Hide the windows of the front app. To view the front app but hide all other apps, press Command-Option-H.
Minimize the front window to the Dock. To minimize all windows of the front app, press Command-Option-M.
New: Open an new document or window.
Open the selected item, or open a dialog to select a file to open.
Print the current document.
Save the current document.
Close the front window. To close all windows of the app, press Command-Option-W.
Quit the app.
Force Quit: Choose an app to force quit. Or press Command-Shift-Option-Esc and hold for 3 seconds to force just the front app to quit.
Spotlight: Show or hide the Spotlight search field. To perform a Spotlight search from a Finder window, press Command–Option–Space bar. If you use multiple input sources to type in different languages, these shortcuts change input sources instead of showing Spotlight.
Quick Look: Use Quick Look to preview the selected item.
Switch apps: Switch to the next most recently used app among your open apps.
Switch windows: Switch to the next most recently used window of the front app.
Screenshot: Take a screenshot of the entire screen. Learn more screenshot shortcuts.
Preferences: Open preferences for the front app.