Coordinate Systems Viewports And Transformations

From Svg wiki

Where are coordinate systems, viewports, and transformations covered in the SVG specification?

Coordinate systems, viewports, and transformations are covered in section 7 (http://www.w3.org/TR/SVG/coords.html) of the SVG specification.

How can I figure out this ViewBox thing?

Perhaps the viewBox is best understood by checking out http://www.digitalcraft.com.au/svg/tools/03/viewbox.aspx