Langley Flying School presents a trivial theory of lift under Aerodynamics and Theory of Lift:
Lift by pressure differential is based on the theory of Daniel Bernoulli: the faster a fluid flows (including air), the lower will be the pressure surrounding it.
Given the difference of the camber of the upper and lower surfaces, the air passing over the foil has greater distance to travel than the air passing under the airfoil.
The air passing over must therefore travel faster than the air passing under the foil.
A low air-pressure region is created above the accelerated air flow.
This is yet another evidence that the science of aerodynamics has collapsed, see also the previous post.