How do planes stay up?
A wing pushes air downwards, and the air pushes the wing up. That push is called lift. Go faster or tilt the wing more and you get more lift, but tilt it too far and the wing stalls.
A wing pushes air downwards, and the air pushes the wing up. Go faster or tilt it more for extra lift, until it is tilted too far and stalls.
Four forces
Four forces act on a plane in flight: lift pulls it up, weight pulls it down, thrust pushes it forward and drag holds it back. In steady level flight they balance.
How a wing makes lift
The wing is curved on top and tilted slightly upwards into the airflow. It bends the air downwards, and as the air is pushed down the wing is pushed up. The air over the top also speeds up and its pressure drops, which adds to the push.
Speed and angle
More speed means more lift, which is why a plane has to roll along the runway before it can leave the ground. Tilting the wing more also gives more lift, up to a limit of around 15 degrees on many wings. Beyond it the air can no longer follow the top of the wing and the lift suddenly drops. That is a stall, and it has nothing to do with the engines stopping.