It also gets into the complaint about cultural specificity from the original comment. It might be Cooking 101 - for French cuisine. But to insist people learn to make the French mother sauces from scratch before eg. tacos or curry seems a bit too narrow-minded for "Cooking 101" generally speaking. I think "Salt Fat Acid Heat" has the right idea here.
edit PS: there is almost always a non-gatekeepy way to say the exact same thing. "In my experience, a homemade bechamel adds an incredible homemade taste to lasagna. I'd definitely recommend learning about the French 'mother sauces' sooner rather than later!"