I assume you're referring to the actual code since you'e speaking of building video games.
My best guess would be that he is referring (in a roundabout way) of code structure and standard practices.
There are many variations depending on who you ask, and the language. It's never a bad idea to learn good habits early (like proper spacing and indentions for easy readability), but in my opinion, before you were about "design patterns", you need to understand what the code actually does, and how to write it!
Edit: Forgot to add...
If you are wanting to get into the programming side of OTs, then C++ is the language of choice used by all major server distributions.
If you want to be a scripter, then read up on lua