where to go and what forum should I follow? where to go and what forum should I follow?
Not 100% sure what you're asking for. I'll assume you're a developer & asking how to get familiar with Sitecore. If so, this is what I'd start with.
Take the free developer foundation class. That’ll get you started. https://elearning.sitecore.net/Public/ContentDetails.aspx?id=4D65DA79A42744A59B68DAF2895770BE
Then watch the Sitecore Habitat videos. https://www.youtube.com/playlist?list=PL1jJVFm_lGnx1MjuBD-GGvwvQUVsckDj_
Then download Habitat Home and see if you can get it installed. It’s an example site that is built on Sitecore 9.1 and SXA https://github.com/Sitecore/Sitecore.HabitatHome.Platform
Get a 60 day developer license – Form at the bottom of the page. https://www.sitecore.com/getting-started/implementation/developing-on-sitecore
As far as a forum; join the Sitecore Slack channel. https://drive.google.com/open?id=1bAVDgP5-FhFh8ohPchHtifq-rz7EBkuPojAzdEofJyo
Hope this helps.