Ask HN: What are some great learning communities? code reading club?

I recently attended a Analytical Number Theory Club at https://offbeat.cc/iant . It helped my read through the stuff leaving procrastination aside.

Next I'll be attending the Rust Compiler Code Reading Club at https://mojosd.medium.com/rust-code-reading-club-8fe356287049

Is there a platform for these clubs? The tools for a good learning community seems to be missing?