Do you mean C
airo Dock? If so, you might want to change the thread title.
I'm running Cairo Dock on Mint 19 as a software-selection hideaway dock at the top of my screen (as well as using MATE's normal panel at the bottom of my screen). If I can help you with the configuration, I will, but I'll need more info on what configuration option(s) you're having problems with (just pick one which doesn't work and we'll concentrate on that to start).
Gnome is a desktop environment. Please see this thread for some info on this and similar concepts:
https://www.linuxquestions.org/quest...ro-4175623119/
Ubuntu used to use Unity, another desktop environment, but no longer does.
There are other desktop environments such as KDE, Cinnamon, MATE, Xfce, etc. You can try these out as live boot disks to see if you like them. I personally use Linux Mint 19 MATE.