how to load jobrequisitions.dat with minimal mandatory fields only

Summary: I went through the below documentation before i started doing a basic load of open job requisitions, as part of our data migration requirements:

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Examples of Loading Job Requisitions

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However i need further clarifications on the below points please?

1., I am including the METADATA JobRequisition, PostingDetails, Language, HiringTeam, JobProfile as suggested in the above link; however are they all mandatory or i can do a basic load with just few of these discriminators?

2. Query to fetch the primary location name to be used under METADATA JobRequisition. We tried many times with exactly the primary location name as updated for few test requisitions in the system, but maybe missing something.