"Elementary" does not mean simplistic, it means elemental- the most minute aspects of a more complex structure.

Sam and Nick Soleyn’s book, The Elementary Doctrines, is must-have information for any Christian who wants to understand the basic principles underlying the kingdom of God.  In this podcast the book is presented chapter by chapter for anyone with a long drive or some time on their hands to ingest this basic primer that many of even the most mature in Christ may not have considered.