How do I fix shortcuts that don't work on Mac?

How do I fix shortcuts that don't work on Mac?

Please go to "System Settings > Keyboard > Keyboard Shortcuts" first and confirm that the default shortcut for that command hasn't been changed or disabled; once confirmed, it should work again. The reason is that the mouse writes keyboard commands back to the hardware before sending them, so shortcut failures are usually related to the system's keyboard shortcut settings.