How to Indie Hacker?

I recently discovered indie hackers from an ai search engine. Spent a few months navigating, there seem to be a lot of hidden features on this website like Discussion groups, Build board, and Meetups. Strangely enough i had to scroll all the way to the bottom of the page to find these interesting activities hidden away.

Would love to hear feedback about this:
Did you know about these features?
Have you participated in these Discussion groups, build boards, or meetups?
-if yes, how was it? and how did you grow from it?

Lastly am I missing any other features this website offers for its users?
Is there a resource that explains how to navigate the indie hackers website?