This page introduces a number of V-Ray for Maya tutorials.
The How-To section offers tutorials suitable for beginners. They guide you through basic options and parameters in order to achieve some common effects.
Utility Texture Tutorials
The XGen Tutorials section contains a number of tutorials for using V-Ray for Maya with XGen. Note that these tutorials pertain specifically to the use of V-Ray with XGen, not the general use of XGen itself.