Move Tool

Move Tool can be used to transform and position content, along with selections. Make a selection of layer / mask content you would like to alter, then use Move Tool features as outlined below:
More on Selection here
note: if no selection available - whole content of target layer / mask will be affected.
note: empty selections can be transformed too.
hotkey: V

Move - click & drag anywhere in the canvas view to move content. To nudge use the arrow keys on keyboard
Scale - scaling content can be done by dragging square handles on the corners and sides.
Modifiers:
hold Shift key to preserve content proportions.
hold Alt key for symmetry.
Rotate - click & drag the teardrop-looking handle located above content.
note: you may need to zoom out a bit if the handle is not apparent in the current scope.
Modifier: hold Shift for 5 degree increments snapping.

Tool Options
Position - content position can be monitored and set through X and Y fields.
(!) Position used is the center point of content.
Angle - content rotation can be monitored, set and reset through angle field; in degrees.
Dimensions - content dimensions in pixels can be monitored and set through W and H fields.
Also use dedicated buttons:
[ fit ] to scale fit content within the canvas boundaries
[ h ] to center horizontally content on a canvas
[ v ] to center vertically content on a canvas
[ reset ] to restore original content size

note: pasted or imported content that does not fit canvas boundaries - will be automatically fit. However you may still restore content's original dimensions by pressing reset button.