My top two rules lf GMing:.
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Spend the most time on what your players find interesting and skip over the parts they don’t enjoy. Let the story follow the former and avoid the latter.
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The easiest way to know what your players enjoy or want more of is by asking them!
Another one I really like is : your players never miss, sometimes their opponents or circumstances make things harder though.
Examples:
Granted, this works in games where the player characters are presupposed heroic and competent, wouldn’t use it in Dark Heresy or Cal of Cthulhu, probably