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 your server uses JWT token set to YES and set:
Most of the Jitsi Meet servers does not user JWT configuration so you can leav it empty.
You can use this free testing server to host your meetings.
Jitsi Meet free testing server configuration Domain: meet.jit.si