AoA (Angle of Attack) in the fewest words? Lift occurs when a moving flow of gas (air) is turned by a solid object. The flow is turned in one direction; lift is generated in the opposite direction (Newton’s third law).
AoA is the aircraft’s tilt angle contribution to increasing the amount of turn of the moving flow of gas.
Zero AoA: only the wing’s shape turns the flow of gas.
Positive AoA: the tilt of the wing adds to the amount of turn of the flow of gas (more change in direction), increasing lift at a given airspeed.
At any particular airspeed, there is only one amount of lift that will ever be created at a given tilt angle. Flying the right AoA is what enables you to match total lift to your weight (stay flying) at any airspeed.
(Newton vs Bernoulli debate? Nature isn’t debating: Newton=Bernoulli; conservation of momentum solution is equivalent to pressures exerted from change in flow velocities solution)