I think I have a fundamental disagreement with that. I disagree that “Nailing Exposure” is the most important thing, it’s “Nailing Lighting.” More to the point, it’s about learning how to see light and seeking out good light.
When the lighting is poor, the photo is no good, and it doesn’t matter how you twist the dials.
In my current pursuit, concert photography, the lighting is always poor, and you have to create ways to position yourself to optimize the result. And you have to twist the dials a lot.
To summarize: When the beginner asks about exposure settings, we should steer the discussion to lighting. With modern sensors, the Aperture and Shutter controls are more about controlling blur.