Welcome :)
Do people do hashtags here?
Lemmy has no special support for hashtags. We generally do not use them. But there will be hashtags leaking through from Mastodon and other fediverse platforms. However, for the Lemmy, they are just a part of the simple text. Nothing to click on, etc. Lemmy was supposed to be community following-driven, as opposed to user of hashtag following-driven #noHashtags I am not sure if any changes are planned in this area. One could always look through the GitHub issues and/or ask the developers. But you can still search for them across posts using the search function at the top right (they would be handled as a normal text again, though).
P.S.: I have never used hashtags, so… What is the appropriate naming convention for hashtags? camelCase, flatcase or something different?