"The most common keybinding change is the super key. Regolith uses Xresources as the canonical source of truth for settings, which are read by various UI components. The table of Xresource keys open to user configuration can be found here. To change the default super binding from the windows key to alt, add the following line to the file ~/.config/regolith/Xresources:"
In the Keybindings page (https://regolith-linux.org/docs/getting-started/configuration/#keybindings) there is a link missing (1st paragraph, word "here", my highlight):
"The most common keybinding change is the super key. Regolith uses Xresources as the canonical source of truth for settings, which are read by various UI components. The table of Xresource keys open to user configuration can be found here. To change the default super binding from the windows key to alt, add the following line to the file ~/.config/regolith/Xresources:"
I believe the link should be: https://regolith-linux.org/docs/reference/xresources/
Hope it helps.