@chrismmurray_EG those are nice topics, particularly the most useful for what I see mostly asked in the forums and that would catapult the engine usage by miles would be in the following order:
Materials,
C++/Blueprint,
AAA Game Scene,
Sequencer,
Realtime Mocap,
Audio,
VR Dev,
Magic Leap,
Revit (this one by last because besides specific, it will benefit from some of the previous topics)
My focus being on film makes the 6 first topics a bit obvious and having a learning path composed of those topics would be great!