Kubernetes has a general mailing list/forum, as well as mailing lists for every SIG and frequently for each working group as well. The common forums include:
- https://groups.google.com/forum/#!forum/kubernetes-users
- https://groups.google.com/forum/#!forum/kubernetes-dev
The list of SIGs at https://github.com/kubernetes/community/blob/master/sig-list.md also includes a reference to the individual mailing lists for each SIG.
There is no one path for information on Kubernetes, and the community works very hard to accommodate multiple ways to get information, ask questions, and encourage participation.