Config options are very easy to understand:
To see the meaning of a config option / parameter, you can hover the moose over the name / title of that config option.
If you dont know this info you can go to your BigBlueButton server and use bbb-conf to display this information using bbb-conf --secret.
You can use this free testing server to host your meetings.
BigBlueButton free testing server configuration URL: https://test-install.blindsidenetworks.com/bigbluebutton/ Secret: 8cd8ef52e8e101574e400365b55e11a6