[GianFabien]

Marketing courses, taught by academics suffers from the :

    In theory there is no difference between theory and practice.
    In practice there is.

Just like any sport, reading a book and watching videos won't make you any better. Only practice on the playing field does. Same with sales and marketing.

[Jiahang]

Yes, but the marketing course involves a lot of case analysis. I think these can largely avoid some troubles I may encounter.