I bought a course on Udemy on Go, and I regret buying it. It turns out, the author skips a lot of essential material to get to the point. The code does run, but users are confused about the lessons. I guess I’ll ask for a refund, if there is one.
@renevanbelzen There was a refund option. The funds are added to my Udemy credits. Since it's an iTunes purchase, I fully understand why this is (read: Apple tax).