Gnome is the graphical shell that comes with Debian and Ubuntu by default.
Usually I use keyd
to configure keybindings,
but the most important keybindings can be configured without any
external programs:
gsettings set org.gnome.desktop.input-sources xkb-options "['altwin:swap_alt_win', 'caps:ctrl_modifier']"
You can also customize keyboard shortcuts directly in the Settings app under Keyboard > Keyboard Shortcuts > View and Customize Shortcuts.
For example here are some of my Window-related shortcuts:
https://gitlab.gnome.org/GNOME/gnome-shell