Do you have troubles adapting to this fandom? No worry! Here's a quick guide on how to become a good Nanoha fan in only ten steps:
1. Ship NanoFate, if you don't, you must be weird.
2. Claim NanoFate is canon using ship teasing scenes as evidence even though nothing has confirmed it actually is and these scenes don't prove too much.
3. In fanfiction, remember to always portray Fate as a 24/7 Nanoha obsessed perverted bitch that is nothing like her canon portrayal.
4. Hate Yuuno. Remember to always bash anything Yuuno related. Because the guy always interferes in NanoFate despite that no scene like that exists in canon and the fact that if it wasn't for him Nanoha and Fate wouldn't have ever met.
5. Pretty much hate all the male characters, they ruin the non-existant "perfect yuri harmony" of the franchise.
6. Erio and Zafira are the only males allowed to be liked. Remember that Erio must always be a pimp and have a harem in fanfiction. Also ship Zafira with Arf, pay no attention to that they had only some little interaction in the series, ship it anyway.
7. Force NEVER happened!
8. Remember to always overexaggerate the power of Nanoha in forums, not as much as DBZ fanboy tend to do with Goku, but still do.
9. If someone doesn't likes NanoFate, make sure to bash them calling them homophobics and saying lots of stuff that make you look like a heterophobic.
10. Nanoha, Fate, Vivio and sometimes Hayate, Vita, Signum, Reinforce, Subaru and Teana are the only characters that can be written fanfiction about. Also Yuuno, and remember to always put him in horrible deaths or tortures.
Now you're ready!
Sorry it was short, but I had been in writer block for months and still am in a bit, I hope you understand it.
EDIT: This is NOT anti-NanoFate people, indeed, I respect the sane fans of it, I'm just poking fun at the Legion (AKA: NanoFate league of fanboys/fangirls) standards that absolutely everyone must like NanoFate, and that the ones that don't are heretics.