Free Range VHDL is a fundamental guide to develop the skills necessary to write powerful VHDL code. The approach taken by this book is to provide only what you need to know to get up and running quickly in VHDL.
As with all learning, once you have obtained and applied some useful information, it is much easier to build on what you know as opposed to continually adding information that is not directly applicable to the subjects at hand.
VHDL is an extremely powerful tool. The more you understand as you work and study with VHDL, the more it will enhance your learning experience independently of your particular area of interest. The concept of using software to design hardware that is controlled by software will definitely provide you with endless hours of contemplation.