In Japanese, the word for way, pronounced "doe", can
used to refer to a type of art form, complete with a formal set
of techniques and lessons to learn in the progression towards mastery.
Some examples include shodo (art of writing), kendo
(art / sport of the sword), sado (art of tea ceremony), judo
(the soft way).
In The Book of Five Rings, Musashi gives his account of
the Way of strategy, which can also be interpreted to mean martial
arts. Both of these are would apply to the Way of the warrior, which
Musashi is addressing. In the book he details the teachings of his
school, Ni Ten Ichi Ryu, which means one way, two swords. While
describing a variety of techniques and principles, Musashi points
out on several occasions that the Way of strategy is not something
that can easily be put into words, but must be reached through diligent
training and reflection.
Musashi's conception of his school as the true Way is recorded
in the final part, in the scroll of the Void. A short, but difficult
part to understand, the Void section relates to the Zen buddhist
conception of emptiness. While a complex topic to explain, it involves
reaching the point where thought and action are one.