I want to be able to hide all the windows quickly.
How can i make an icon or entering which command will help me to hide all of the opened windows and show me a desktop?
If you hold down the 'super' key, which on my keyboard is the Windows key, for a second you can see a list of keyboard shortcuts pop up.
One of them is ctrl + super + D to minimize all open windows, i.e. to go to the desktop.
Due to the debate below, I feel compelled to amend my answer to note that on some systems, the shortcut may be ctrl + alt + D
how to personalize the key combination: