FEDEVEL Advanced PCB Layout: Post Lesson 2 notes

I finished Lesson 2 of FEDEVEL Academy 's Advanced PCB Layout course yesterday. As I expected, there ratio of review to new material (for me) is shifting toward the new stuff. There were a couple of confusing points, like the the instructor's strong recommendation to use a separate via for each power and ground connection on a BGA while watching him demonstrate routing two such adjacent balls to a…