Copyright question for book

Eric Chou · 2023-03-24T11:57:36

Hello, So I'm compiling a book. A lot of it documents my journey with Command and Conquer, both modding, and writing fan fiction. How does copyright work in my situation? It seems a bit grey from all the research I've done, it seems to boil down to: fair use derivative 1 is ok, but 2 is not? How do I know what's what.