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1. The show must be complete, and have lasted at least one full season. In other words, no matter how much you like The Expanse or Stranger Things they are just not eligible. This also means no miniseries (not a "season") and not beloved shows that have been cancelled prior to airing a full season. That means you, Firefly. Please note, however, pace no. 5, below, that if a show has been around forever (with "forever" being defined as at least 10 years) in multiple incarnations (Doctor Who) or multiple series (Star Trek), it is eligible.
11. Science fiction should be given as wide as possible of a definition; if in doubt, it should be science fiction. However, shows like Game of Thrones are probably better as "fantasy" so I'll leave it at that. You can apply your own definition.