When air meets the wing, it splits into two streams, top and bottom, that meet up again in the back. The air passing over the top has to travel farther than the air going underneath, so it is forced to move faster . So the area above the wing has less pressure than the area below the wing. This creates lift . A wing has to be designed not only to produce lift, but also to minimize the friction with passing air, which causes drag.
Every airplane has a specific takeoff speed, where lift overcomes gravity .
The planes propeller or jet engine, meanwhile, has to work to provide enough thrust to overcome drag . It's a simple way to increase the distance the air has to travel over the top. Pilots can make minor adjustments to the wing flaps, effectively changing the wing's angle into the wind. A more tilted wing allows more lift to be created at a lower speed. Try it sometime.