Keyboard shortcuts are keys or combinations of keys that provide an alternative way to do something that you’d typically do with a mouse, trackpad, or other input device. If you are trying to take a screenshot or screengrab, see How to take and annotate screenshots.

To improve your productivity, here’s the list of essential keyboard shortcuts in Mac:

• Command-X: Cut the selected item and copy it to the Clipboard.
• Command-C: Copy the selected item to the Clipboard. This also works for files in the Finder.
• Command-V: Paste the contents of the Clipboard into the current document or app. This also works for files in the Finder.
• Option-Command-V: Move the files in the Clipboard from their original location to the current location in the Finder.
• Command-Z: Undo the previous command. You can then press Shift-Command-Z to Redo, reversing the undo command. In some apps, you can undo and redo multiple commands.
• Command-A: Select All items.
• Command-F: Find items in a document or open a Find window.
• Command-I: Show the Get Info window for a selected file.
• Command-O: Open the selected item, or open a dialog to select a file to open.
• Command-P: Print the current document.
• Command-S: Save the current document.
• Command-T: Open a new tab.
• Command-M: Minimize the front window to the Dock. To minimize all windows of the front app, press Option-Command-M.
• Command-W: Close the front window. To close all windows of the app, press Option-Command-W.
• Option-Command-Esc: Force quit an app.
• Command–Space bar: Show or hide the Spotlight search field. To perform a Spotlight search from a Finder window, press Command–Option–Space bar.
• Control–Command–Space bar: Show the Character Viewer, from which you can choose emoji and other symbols.
• Control-Command-F: Use the app in full screen, if supported by the app.
• Command-Tab: Switch to the next most recently used app among your open apps.
• Shift-Command-5: Take a screenshot or make a screen recording. Or use Shift-Command-3 or Shift-Command-4 for screenshots. Learn more about screenshots.
• Shift-Command-N: Create a new folder in the Finder.
• Command-Shift-Dot (.): Show or hide hidden files in the Finder.
• Command-Comma (,): Open preferences for the front app.
• Command-Delete: Move the selected item to the Trash.
• Option-Command-Delete: Permanently delete selected item, bypassing the Trash.
• Shift-Command-Delete: Empty the Trash.
• Option-Shift-Command-Delete: Empty the Trash without confirmation dialog.
• Command-Q: Quit current app.
• Control-Command-Q: Immediately lock your screen.
• Shift-Command-Q: Log out of your macOS user account. You will be asked to confirm. To log out immediately without confirming, press Option-Shift-Command-Q.
• Power button: Press to turn on your Mac or wake it from sleep. Press and hold for 1.5 seconds to put your Mac to sleep.* Continue holding to force your Mac to turn off.

Resources: Visit Apple official docs for more keyboard shortcuts in Mac. Or, other shortcuts on Mac: Choose Apple menu  > System Settings, click Keyboard, then click Shortcuts.