I am unusual in that I grade, online and mix audio for broadcast. If you wish to learn what I have from years in broadcast telecine, plus building and running my own post house for 25 years from a blog or online tutorial, then good luck. Meeting tech specs is just the beginning. Learning to be creative within those technical boundaries is the real challenge.
I can tell you that with FCP it is possible to produce broadcast spec pictures, but mixing audio in FCP is not going to deliver the pre mix stems and quality result that a proper audio studio will produce.