Recommended tutorial on VU/Peak/RMS (TODAY's FTM Lesson)

There are still some things I'm not grasping from today's FTM seminar (seminar...is that what old people say?). Is there a recommended video that video that can explain this to me like I'm 2? I think one of the most confusing things is calibrating the VU meter to whatever RMS you want (-18, -15, etc). What is the purpose of the meter if it's not measuring something objectively? More questions than that...I checked the classroom not seeing anything corresponding.

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