Dragging gizmo arrow handle will move the transform towards X, Y or Z.
Dragging gizmo pan handle will move the transform on plane XY, YZ, or ZX.
Click Local / World Dropdown will change transform position based on local or world space.
Dragging gizmo handle will rotate the transform around X, Y or Z axis.
Click Local / World Dropdown will change transform rotation based on local or world space.
Click Snap Toggle will turn on or off snapping, which will rotate in increments of 5 degrees.
Pivot / Center Dropdown shows only when multiple transforms are selected.
When Pivot is selected, each transform will rotate around its own pivot point.
When Center is selected, all selected transforms will rotate around the geomerty center of the transforms.