How to Write a Good Fan fiction/ Story

Hello my name is Rosemari and I'm going to give you some good tips for writing a story or  fan fiction

So i've been texting a certain Wattpad user and the text me that the were going to write a fan fiction . At first I was thrilled because the have never written a fan fiction before. But then they said the were doing cat woman. Don't get me wrong I LOVE cat woman but she is interrupted in so many ways and is different in how do i say this. Every time she is in something Movie, Comic, TV show ect. She does not have the same...character sometimes she has a romance with batman , or she is an insane person ect. So I told my friend do you know everything about cat woman have you watched the show read the comics watched all of the movies. All the said is that's what Wikipedia is for. Then I started to Rage on the user. I'm not say not to use Wikipedia at all but it's not always the truth. And when writing a good fan fiction you want all of the info before you write it. And I told them this and then they completely ignored it and started asking me questions like 'What does she fight for'  I told them . Then they stared doubting on it and saying 'Are you sure that's what she fight for' and 'I don't think that is what she fight's for'. So now i'm wirting this story to help other that might have this problem.

Also any body that reads this get the user' AlexLacoste' to read this because they need to see and read this for there cat woman fan fiction that he want to write.