This product is an add-on to the Volumetrics in Houdini and Octane training. These series of videos will show you how to render a variety of volumetric effects in Mantra but they will not cover how to build the volumes. That section is covered in the main training.
However, the files that you will get along with this training are completely open and you can always just go through the files and see how the volumes were built.
This training will cover how to work with the pyro shader in Houdini to render a variety of effects and how to modify and customize the pyro core shader at VOP level.