
Command-X: Cut the selected item and copy it to the Clipboard.
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Command-Comma (,): Open preferences for the front app. Shift-Command-N: Create a new folder in the Finder. Shift-Command-4: Take a screenshot for selected area. Shift-Command-3: Take a screenshot for full display content. Shift-Command-5: Take a screenshot or make a screen recording. It's generally the key above the Tab key and to the left of the number 1.) (The character on the second key varies by keyboard. Command–Grave accent (`): Switch between the windows of the app you're using. Command-Tab: Switch to the next most recently used app among your open apps.
Space bar: Use Quick Look to preview the selected item.Control-Command-F: Use the app in full screen, if supported by the app.Control–Command–Space bar: Show the Character Viewer, from which you can choose emoji and other symbols.Command–Space bar: Show or hide the Spotlight search field.To close all windows of the app, press Option-Command-W.
Command-O: Open the selected item, or open a dialog to select a file to open. To minimize all windows of the front app, press Option-Command-M. Command-M: Minimize the front window to the Dock. To view the front app but hide all other apps, press Option-Command-H. Command-H: Hide the windows of the front app. To find the previous occurrence, press Shift-Command-G. Command-G: Find Again: Find the next occurrence of the item previously found. Command-F: Find items in a document or open a Find window. In some apps, you can undo and redo multiple commands. You can then press Shift-Command-Z to Redo, reversing the undo command. Command-V: Paste the contents of the Clipboard into the current document or app. Command-C: Copy the selected item to the Clipboard.