There are three main community spaces made available to users of the toolchain.
For asking questions and longer-form discussion, a good place to start is the forum thread on NESdev. With enough activity, it might become a subforum!
While I feel forums are better for preserving technical insight, there is also a Discord server available, at least for the time being. An IRC bridge may be provided in the future, if user demand exists.
To report bugs and feature requests, use the issue tracker on GitHub. Feel free to consult first if you're not certain whether what you're observing is a bug, or if a feature is not already present.
Each community is governed by its respective rules. However, some general advice applies to all Wonderful Toolchain-related discussion: