I just bought a book (quite expensive I might add) by one of the current keyboard guru’s because I am always trying to learn and increase my knowledge base and it was highly recommended by a young coach. It was full of marketing, buzzwords, pseudoscience and general mumbo jumbo. In addition, I suspect good portions of it were copied without any attribution or reference to the sources.
Think critically. Know your science, know your practice, understand and apply sound training principles and know your history so you can trace the origin of ideas. Good training methodology is not a 21st century phenomenon. Make sure before you follow someone that there really a there there? Beware of intellect incest, the phenomenon of passing ideas within the same group without any critical analysis. Think!