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The engine of the aircraft provides a forward force that is called "thrust", which counteracts the force from air resistance, which is called "drag."
Suppose that the air around a wing is completely still.
Now suppose the wing is moving relative to the air
Airplane Wing
A component of the lifting force is now pointed sideways, and this allows the airplane to turn and change direction.
If the force of lift is stronger than the force of gravity, the airplane's elevation increases.
As we increase the angle of the wings relative to the direction of the incoming air molecules, the lift increases.
The amount of incoming air flow can be altered by changing the airplane's speed.
However, right before the airplane is about to land, the speed may be so slow that the wings are not generating enough lift.
It is always desirable to land into the wind, so as to shorten the amount of runway necessary to stop the plane.