ISLANDER
Yaw is not required to turn an aircraft, otherwise the accurate pilot who keeps the ball exactly in the middle during turns, commonly known as an autopilot, would not function.
For the purpose of PPL training I will stick to the NASA explanation, which is
The aircraft is turned through the action of the side component of the lift force.
One simple statement thats all thats needed, Just because something is written in a book dosnt mean its correct or do you really believe people can walk on water too!