Time for action — moving an object in one plane in global mode
Sometimes you want to move an object freely, and sometimes it's better to move it along one axis. Here's a way to move it, by specifying the axis by letter:
Load a new file into Blender.
Select the camera with theRMB. Press the G key to grab it. Now move your mouse.
Now press and release (tap) the Z key and move the mouse.
Now tap the X key and move the mouse.
Now tap the Y key.
Press theRMB to let go of the camera.
What just happened?
You discovered that you can restrict the axis that you move by pressing the G key and then pressing the key of the axis that you wish to move in. This gives us similar control to using the 3D Manipulator.