The chapter on 1-2 Thessalonians in A Biblical-Theological Introduction to the New Testament: The Gospel Realized is helpful for understanding the structure of the book. Listeners that want to do some real digging into the theological, history, and literary form of Thessalonians should consult Gordon Fee’s volume in the NICNT series. Two shorter commentaries worth consulting are The Message of Thessalonians by John Stott, and Nijay Gupta’s volume in the NCCS. As always, check out the Bible Project video on 1 Thessalonians: https://youtu.be/No7Nq6IX23c & 2 Thessalonians: https://youtu.be/kbPBDKOn1cc