Purging Wi-Fi Connections

I’m about to give my old Toshiba laptop to a new owner, but for security reasons I would like to remove any previously used wi-fi passwords. Is there a folder that I can purge to safely delete them?

The laptop has Lite 15.3 installed on it.

Seems like /etc/NetworkManager
See https://fossbytes.com/find-saved-wifi-passwords-linux/

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