Shear objects: where's angled axis and how to understand coordinates?
I'm a beginner: please, help me to understand how to interpret coordinates so that I could rely on calculated values and not just on visual guidance.
I have an object I'm applying shearing to.
Object--Transformation preview.
Position 1, pic 1: axis angle - 30˚, slant - 45˚

Position 2, pic 2: axis angle - 19˚, slant - 31˚. All values are arbitrary, just for the demonstration purpose.

Info panel. Using shear tool
Position 2 transformed into position 3. Position 3, pic 3: axis angle - 180˚, slant - -115,423˚ (negative)

My questions:
#1 Where exactly does the axis cross the object at an angle?
#2 Do the slant and axis angle value changes imply 3D rotation?
#3 Position 3
Regarding usage of the shear tool. What points on the object and what movement do the values in Info panel correspond to exactly?
