by Chris Tyler:
Fundamentals: Basics » X, Y, and Z
These videos discusses the basics of the X, Y, and Z axes. Note: Design 3D CX interface is shown but the operations are the same for SE.
Spacebar (held): View Pan
Spacebar+Shift (held together): View Rotation
This is a simple tutorial for new users.
If you want extended basic information about X, Y and Z, watch the following video.