Fiction is lies; we're writing about people who never existed and events that never happened when we write fiction, whether its science fiction or fantasy or western mystery stories or so-called literary stories. All those things are essentially untrue. But it has to have a truth at the core of it.
I believe that a writer learns from every story he writes, and when you try different things, you learn different lessons. Working with other writers, as in Hollywood or in a shared world series, will also strengthen your skills, by exposing you to new ways of seeing the work, and different approaches to certain creative challenges.