Lift is produced due to relative velocity between fluid and the solid to be lifted. The three theories out of which two are completely wrong

The boundary layer separation phenomenon is seen when the pressure in the fluid starts to increase after reaching the highest point, due to

Bernoulli's Equation states, for an ideal flowing fluid at any point sum of Total pressure energy and Gravitational energy remains constant.

Stationary fluid has Static pressure. Fluid in motion has Dynamic pressure. Total pressure or Stagnation pressure is summation of both.