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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.Command-X: Cut the selected item and copy it to the Clipboard.