Bernoulli's Principle
I've found that if you can understand Bernoulli's theorem, you'll pass the CASA CPL aerodynamics exam (CADA) with ease. Even if it is wrong, if everyone learns it then at least we're all on the same page. So what if it's wrong anyway? There are more important things than why the wing produces lift, like picking a spot to go after an engine failure in the Lance at 400' AGL.