and fully back will get you to the stall speed. (so avoid fully back..!)
Well..... not absolutely...
It is certainly possible to stall an aircraft accidentally, or deliberately, with the controls
not all the way back. The application of pitch control, and resulting effect on what the aircraft does are dependent upon many factors, which all inter relate.
(so avoid fully back..!)
..except when taxiing, when it is definitely required to protect the prop from damage by stones etc.
Well it is on our airfield.
Very much so! Controls fully back while taxiing, and at application of power for takeoff (then relax as speed builds). In a high wing tricycle Cessna, the proper use of full nose up elevator while taxiing is greatly enhanced by taxiing with 15 degrees of flaps extended. That improves the effectiveness of the tail in raising the nose, by changing the downwash off the wing onto the tail.
Cessna oleo struts and propellers are expensive to repair and replace, so minimize wear and tear on them at all opportunities!