Necropolis versus Academy.

Yeah. It seems that practice always follows theory. If you're not familiar with the basics, practice won't be of much use. In other words, if you don't know the subject, how can you even play Heroes without understanding the fundamentals?!

You really need to read the manual, and pay attention while you're at it, otherwise you'll get confused about the concepts, and consequently, the meaning of what's written will be distorted, leading to a misunderstanding of the topic being discussed...