Hi Sypherin,

Khan Academy is geared more towards the school setting and not really sports.  The "fundamentals of coaching" isn't really something that can be "taught" due to the fact that it is a subjective topic who's answers vary from person to person.  Every coach has their own way of teaching, so to teach millions of people the fundamentals of coaching from one person's perspective may not be the best way to go about that.

Hope this helps!

Elijah