No doubt, Arthur Buckley was a legend. This was the first book that I've read on card sleights & manipulations, and since then, books have been my favorite way of learning magic. The moves are VERY advanced (Buckley's Slap Shift is my favorite one), but they will make you appreciate how intricate & creative sleight of hand can be. Moreover, it made me realize how magic books contain hidden gems that can never be found on the internet -- it is like finding gold from a chest. So please, if you currently learn magic only from YouTube (nothing against that, btw), I strongly encourage you to also occasionally learn from books. You'll be baffled by the secrets you can discover.
Just my two cents :)