James, completely understand the frustration!
Studying and developing knowledge on scrum and agile is a great practice before getting into the people, process, and BE subject matter. The reason for this is similar to understanding the principles and concepts of what traditional or waterfall project management is. You will then learn how traditional and agile combine to form hybrid PM. This knowledge is the foundation that will enable you to answer your people, process, and business environment questions. Best of luck and thanks for using the resources you have to get better!