SAFe - in the Community

How many?
As a recently qualified SAFe Programme Consultant, I have been looking around the Scaled Agile "community". And it was both a bit confusing and a bit interesting...
It is hard to know which forum to "join" - I don't know the difference between a SAFe Agilist and a SAFe Practitioner. Do you join the general forum and a/all specific forum/s? Should you sign up to some other forums to see what people are talking about? What's happening over in the "Government Practitioners" forum?
It was interesting because the member counts on the forums might be indicative of the general level of interest in that area (although I suspect that some of the forums are newer than others). They might provide some idea about the popularity of that particular course or subject area.
If so maybe the most popular subjects are:
- Scrum Mastering
- Product Ownership
- Program Consulting
- DevOps
- Release Train Engineering
- Lean Portfolio Management
My personal interest lies in the product area and helping product teams gel. Joining a scrum team as a product owner can be daunting and everyone has a view on what you should be doing. Having a clear idea of what you think you should be doing will help quickly build trust with your team.