In Windows, there is a keyboard shortcut ⊞ Win + D used to minimize all the currently open windows and show the desktop.
To hide all windows and show the desktop in MATE edition of the Linux Mint there is a Ctrl + Alt + D shortcut.
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“Show Desktop” Shortcut in Linux Mint (MATE)
If you want to change this shortcut, search for the “Keyboard Shortcuts” application in the Linux Mint’s “Applications” → “Preferences” menu or simply lunch it by executing this command from the terminal:
In the “Keyboard Shortcuts”, scroll down to the “Window Management” header and search for the “Hide all normal windows and set focus to the desktop”.
The “Show Desktop” shortcut can be changed there.