I dont understand Reddit

Im this 🤏🏻 close to giving up. I made this account forever ago, hoping to find community with others of similar interests. Every time I've tried to post in any group (sub reddit? Idk) my post immediately gets taken down.

I have no idea what im doing wrong.

This app is worse than tiktok.

I changed my profile Pic to my halloween costume, Mothman, and now it just says NSFW? Its a freaking moth?

Anyway someone plz tell me what im doing wrong and how tf this app works. 😑