Preferably those that are related to interviews and web development.
1. What do I want to learn?
2. Regarding that particular topic's community: on which online chatroom platform is it most active?
For example, Discord hosts official communities for: Strapi (headless CMS framework), NestJS.
Whereas IRC (Libera server) hosts official communities for: NodeJS. I don't recall if other IRC channels I visit are official-- but it has many other great chat rooms.
Some are on both. For example (Note: I am not sure if this particular site represents Linux officially)--> "This is the official site for the Linux.Chat community, namely #linux on Libera and Linux.Chat on Discord" [1].
Note they list IRC first, Discord second. That's my approach in terms of prioritizing the two, as well: Personally I prefer IRC for its simplicity and old-school history & philosophy.
I seriously do not like it isn’t publicly indexable. So much lovely stuff gets lost when they close a channel.
This discord has been phenomenal for C++.