Toggle Select

...then double click items in the scene.

The selection change will affect several tabs.

Toggle Move and the move gizmo will appear at the center of the selected item. If you have many things selected it will appear at the center of the last item.

Click and drag the spheres to move in a straight line. Click and drag the squares to drag in the plane.

Toggle Rotate to get the rotate gizmo. Click and drag the boxes to rotate. The white lines snap to 5, 10, and 45 degrees.

Click the globe to change the frame of reference. The two frames available are World (globe) and Local (eye). Local is the frame of reference of the last selected item.