As Sitecore community has voted, https://www.youtube.com/user/ | Sitecore Telegram

As Sitecore community has voted, https://www.youtube.com/user/mastersitecore channel has now been renamed to Discover Sitecore.
But not just that, what is really important is that channel now features many extremely meaningful videos, including those from Sym2020.
Containers, Headless, NextJS, SXA at least - this channel covers it all. Best for learning!