After reading a recent article on here about engineers-turned-CEOs, I realized that as an engineer I'd like to learn more about sales, marketing and advertising. There is only one course on Coursera on intro to Marketing, but I'm wondering if there are any other places HNers would recommend for learning the non-engineering side of running a startup.
Business-section on udemy (both free and paid): https://www.udemy.com/courses/Business
NovoEd entrepreneurship courses (both free and paid): https://novoed.com/courses/entrepreneurship
Startup sales email course (free): http://close.io/free-sales-course/