The best way to learn something is incredibly subjective. I looked at SICM once, and I got nothing out of it. I learned classical mechanics from Arnold's "Mathematical Methods of Classical Mechanics". Now, I have total conviction that this is obviously the best way to learn it and I find it incomprehensible that anyone could disagree. And yet virtually nobody learns classical mechanics that way, so it's probably more of a idiosyncratic fact about me, and not a universal truth.