Certain details will make the reader back out of reading a fanfiction.
For example: having lots of spelling and grammar mistakes.
If you want people to enjoy your fanfiction remember that having grammar and spelling is key. If you're not sure how to spell something correctly you should search the correct spelling.
It is fine if you have a few mistakes but when every other word is spelled incorrectly it may annoy the reader.
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Guide to Fanfiction
RandomAlmost everything you need to know about the world of fanfiction.