Command ⌘ + A = Select all contents in a document or application.Command ⌘ + Z = Undo the previous command.Command ⌘ + V = Paste a selected item from the clipboard into your document or application.Command ⌘ + C = Copy a selected item to the clipboard.Command ⌘ + X = Cut a selected item to the clipboard.If you are going to be a regular macOS user, then here are a few basic shortcuts or key combinations that most users will find handy while trying to get their heads around a macOS. Remember, you can use this method to change other shortcuts for the same or other applications as well, but we would recommend you do this only for shortcuts that you use extensively. If you select the View menu in the Chrome Browser Menu, you will see that the Reload This Page option now shows F5 as the shortcut.