I feel like most of 4chan's special interest boards are good if you can sift through them. I wouldn't say it's in-depth all the time but if you lurk enough and come across a good thread it can actually be pretty informative. Even asking questions in a thread is relatively guaranteed to get a response, albeit may not be the response you want, but they're generally helpful if you're on topic.

Also, lainchan.org is pretty top tier if you want a more tech oriented chan.

Alternatively:

https://8ch.net/tech/index.html

https://lainchan.org/