Fig. 1 Ubuntu's help of common keybindings which I would like to find too in Debian, Fig. 2 Searching desktop in super-view of Debian

I am thinking if there is any hovering cheat sheet in Debian, see Fig. 1 for the corresponding feature in Ubuntu under two times of super. I am struggling to find features in Debian such as

• show only Desktop - in Ubuntu ctrl+d but cannot find it in keybindings, not in any icons and not in Debian's search of Fig. 2
• ...

OS: Debian 8.5

Fig. 1 Ubuntu's help of common keybindings which I would like to find too in Debian, Fig. 2 Searching desktop in super-view of Debian

I am thinking if there is any hovering cheat sheet in Debian, see Fig. 1 for the corresponding feature in Ubuntu under two times of super. I am struggling to find features in Debian such as

• show only Desktop - in Ubuntu ctrl+d but cannot find it in keybindings, not in any icons and not in Debian's search of Fig. 2
• ...

OS: Debian 8.5
Window manager: Gnome 3.14