Interested in cerridwen, not sure where to start

I’ve heard the story of cerridwen, I’m really interested in her and feel pulled to her, I just have a few questions.

1. Is she a goddess?
2. How to worship her? / what offerings to give her?
3. Any recommendations of resources on her?

And a kind of unrelated question but, are welsh deities considered Brythonic? I assume they are because when I look them up I get this subreddit but I wasn’t sure.

Thank you for your responses!