[grzm]

I've been fortunate that the trainers I've had have focused very much on proper technique and form which lays the foundations to prevent injury. Online, Kelly Starret's Mobility WOD (https://www.mobilitywod.com) is a great resource. I really like his philosophy of teaching people the tools to diagnose their own problems and working on them, both to prevent future injury and notice when injury may be sneaking up on you. His book is good, too. I'm unfamiliar with the one you already have, so it may cover a lot of the same ground.