Silversurfer That documentation doesn't really apply that well to Solus.
Regarding autostart: If they're using Budgie, they can just use the Autostart section in Budgie Desktop Settings. For GNOME Edition, using the Startup Applications in GNOME Tweaks will work. Other editions / DEs have their own methods.
Regarding the shortcut: There is no terminal default, like others have mentioned. This can be set by the user via Settings (GNOME Control Center), as noted by others.