why isn't there an "exceptional sales course" from any university?
Other than the fact that the "teachers" are teaching because they can not do other stuff, the main reason may be that the great salespeople are outside, selling!
And, like all skills, if you don't upgrade every day, you get screwed. You would have to keep challenging yourself. To top that there are ridiculous companies/ courses that publish "Sales and Marketing". Somehow they never seem to understand that their numbers are not good because they have killed themselves!
To learn how to sell, you don't watch youtube videos or read books or attend university. You move your ass and start selling. Every damn day. Always do remember that you are your own best Life coach. Stop paying other morons to tell you what to do. Learn to sell, now.