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I like to add sub-genres or tags to mine but, yes, there is almost always a lot of overlap between sub-genres. Here are the sub groups I use.
Hard Science Fiction - These generally try to project forward from now and try to include real science. They may have a couple obvious non-science items but they generally have a reason for that. (Example: the dust storm in The Martian.)
Military Science Fiction - Honor Harrington, Old Man's War, etc. Naval battles in space or other obvious military applications.
Space Opera - Sometimes overlaps with MilSciFi, sometimes on its own. Hyperion or The Expanse are series that I would put in this but no MilSciFi.
Apocalyptic or Dystopian - self explanatory. I generally only tag these when it's relevant to the plot or a focus of the setting.
Time Travel - self explanatory. I read enough of these that I wanted to track them.
Steam Pump - I'm never sure whether this is science fiction or fantasy. Some of both I guess.
There are a lot more, but these meet my general needs. I'll also tag them thriller or mystery or more generic tags when they are also something else.
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