Hi, @Flo_Nightengale, and welcome. One thing you might want to do is make sure your profile lists topics of interest to you. When they match tags on people’s questions, those questions will appear in your “Questions for You” section, and so it will begin to reflect your interests.
This list will also be built up by the tags on questions you answer and reduced when you click “Not Interested.” (When you click “Remove,” the question drops from your list without affecting your record of interests.)
So even if we don’t have groups as such, because this is not actually a discussion site, you will be shown links for threads that jibe with your interests, and you will find discussions there.
Also, if you click a topic in a tag, you will see links to other questions with the same tag.