Very interesting to learn about Musashi and touch on his advice, was a bit disappointed when the book got repetitive or dismissive ('and of course this is applicable today' etc, several chapters in a row). It felt more like a starting point to look into the various ideas presented - definitely an accessible, quick read on an interesting subject.
One point that I jumped off of is the power of words and how they are presented; the subtle shifts we must differentiate between. The obvious one presented is to focus on the whole picture, but also to hone in on small important details. Take too, for example, the advice to act before the enemy has time to think, yet also to play mind games to mess up his thinking, but also a well-trained warrior doesn't think and acts only on instincts. Strategy can be complicated.
Also, another good point is the explanation that Japanese culture encourages continued learning - e.g., samurai practice daily - there's no peak and then you're done with something. Hobbies and knowledge are lifelong pursuits.