I've written some fics. I usually do Star Trek or Mass Effect, but when I was young and stupid (well, more stupid than now), I ventured into Harry Potter.
Due to my laconic manner of expressing myself, I usually don't go past 2k words, so it's mostly just some vignettes. I'm good at drabbles (exactly 100 words).
As for cherishing canon so much you don't want to screw with it...
You don't have to.
Research is key in every literary work, be it your dissertation, awesome novel (unless you're Dan Brown. Then disregard this) or just some fanfic. I see no reason not to try and set your story within the established rules of the universe you're writing for.
And if you don't do research, I judge you. Because not doing research is lazy and just shows no respect for the canon.
Due to my laconic manner of expressing myself, I usually don't go past 2k words, so it's mostly just some vignettes. I'm good at drabbles (exactly 100 words).
As for cherishing canon so much you don't want to screw with it...
You don't have to.
Research is key in every literary work, be it your dissertation, awesome novel (unless you're Dan Brown. Then disregard this) or just some fanfic. I see no reason not to try and set your story within the established rules of the universe you're writing for.
And if you don't do research, I judge you. Because not doing research is lazy and just shows no respect for the canon.