Reformation and Catholic reform
The Reformation and Catholic reform involve theological convictions, institutional failures, political pressures, and diverse local movements. Trent addressed doctrine and discipline within this setting. Study Protestant positions in their own sources as well as Catholic responses; neither side is well understood through caricature. Historical explanation should distinguish understanding a controversy from dismissing the convictions of its participants.
Follow the sources
An original library introduction, with sources for further study. This is a starting point rather than a complete treatment or a finished formation lesson.