The Art of War is much bigger than just trading - trading is too applied, mechanical and narrow a field for the book to really fulfil its potential. Rather, read it as a guide to principles one might use to improve one's life, especially as it relates to other people and situations.
On the face of it this is a field manual for generals but the guiding principles can be used for obtaining greatest advantage from any competitive situation. Don't expect your trading to radically change overnight, but your life might.
What art exactly is the the Art of War? - 'winning without fighting'.
Everybody with any ambition to improve their lot should read the Art of War. If its guidance resonates in any way, get the I Ching and use it, don't read it, its not a text that can be read from page 1 to the end. Don't get fixated on the mechanics of yarrow stalks and coins, frame your problem in your mind and let the book fall open. Read that part of the book and turn the problem round in the way the text suggests.
Again, trading won't radically improve, but you just might decide to tell your boss / wife / partner / husband where to stick it.