Radio ID is the individual radios, and do not need to be added. If you do choose to add some Radio IDs you must also add a wildcard otherwise you will only hear traffic from the RIDs added.
Talkgroup IDs are the group or channel the agency is using, 12345 Might be Acme Police Dispatch and radio 123000 might be Officer Deputy Dawg 1A12, only the 12345 needs to be added to hear the dispatch.