Wow ... I just discovered "nmtui" to configure Wifi from the CLI / ncurses. No more difficult file editing for Wifi. Nice!   nmtui -> "Activate a connection", then select the Wifi network you want to connect to, fill out the password, and you're done.   After configuring, the settings appear in  /etc/NetworkManager/system-connections/   Only after finding 'nmtui', I found this page https://docs.armbian.com/User-Guide_Getting-Started/#how-to-connect-to-wireless