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So, I'm completely new to Linux, and I have to learn the basic, but I can't make custom commands work in hot corners! Thanks for your help.
try setting the custom command to gnome-terminal, your might have to install it first though. In case of the last use sudo apt install gnome-terminal
sudo apt install gnome-terminal
You can set in Settings/Desktop under the Hot Corners tab (I put pantheon-terminal but you can choose gnome-terminal as well if you have installed it):
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