I'm not sure this makes much sense. Knowing the basics of openings doesn't automatically make you higher rated or have a better understanding.
It does.
If you know HOW to arrange your forces in the opening, without any specific variation memorization, you can enter the crucial middlegame part of the game without fear.
But players at my level do know how to 'arrange their forces' in the opening although sometimes the opening is played inaccurately even if it is following the basics.
I Just Destroyed someone in the caro-kann even though idk any theory!
Caro is very good for <1300 - 1400 level