Transform is a tool to edit the element with Inspector.
There are many ways to edit:

• Translation: you can move element to certain position
  • X: horizontal move
  • Y: vertical move
  • Z: depth move
• Rotation: you can rotate element by certain axis
  • X: rotation in X axis
  • Y: rotation in Y axis
  • Z: rotation in Z axis (this one is more noticeable change)
• Scale: you can change element size
  • X: change horizontal size
  • Y: change vertical size

Sorting is a way to set which element is higher or lower as you can do in layers in drawings Softwares.
Lower sorting value is, higher layer position is.

If theres a element A with sorting value C, and element B with sorting value D. If value C is lower than D, then element A is higher layer position than element B.