Hi Demarques. I like the NSCA’s Essentials of Strength Training and Conditioning. This is a really thorough text book. However, I must say that in my opinion, the best way to “stay up to date” as your question asks, is to read and follow some of the research (articles), journals and blogs from reputable fitness organizations such as NSCA, ASCM and ACE.
Because of the long lead time to get a book published and released, I do not think that reading books is the best way to be ‘ahead’ of the training and fitness curve. The newest, most up-to-date information is found in the journals, not the books.
My two cents 🙂