Welcome!
Feel free to post anything and everything to do with fantasy writing here. The community is open-membership and posting isn't moderated; I don't expect that to have to change, really. You can introduce yourself first, but you don't have to.
For a first discussion topic:
Since it seems to be the topic du jour for some parts of fandom:
With fantasy, the topic might not be sex as often, but I have seen very heated arguments over depictions of gay and bisexual characters in fantasy (and have started them, too); the use of violence; misogyny; race and cultural appropriation (for an extremely long chroncile of a debate on the last subject last year there is this collection of links). There have been plenty of well-reasoned arguments on either side, and sometimes not so well-reasoned. Under that last, I count both extremes of "Anything you write could influence someone negatively, so censor yourself!" and "It's fantasy and not real, what does it matter if every major character we write is white and male and straight and other characters are stereotypes?"
I think the best attitude is simply to be aware of the issues and enter them with eyes open, frankly. Having a Magical Black Man or a lesbian who dies is less likely if you're already aware of the issues.
And be prepared for criticism. I think that was the largest debacle in the cultural appropriation debates; a lot of the white commenters felt they were being accused of racism every time someone nonwhite contradicted what they said, even if that contradiction was just a fact-check.
I also tend to believe that people are influenced by fiction, but also other media- television shows, video games, commercials, advertising, textbooks- and plenty of real people, too, such as their peers and families. Thus, while a single book or story can have a great influence on a single person, most of the time its impact is going to be small and diluted in the face of that sea of other influences. And if a fantasist is committed to addressing issues in an odd or offbeat manner, her voice might well run counter to the dominant trends, and be a positive influence.
How do you address the issue of moral responsibility when you write? Is it something to worry about later? On publication, perhaps? Never?