Honestly, you've kinda already found one of the best, here on Lemmy! Other than that, depending on which distro you choose, the Arch community can be a little terse, but definitely the most knowledgeable and more than willing to help if you do your research first. The Mint community is pretty nice, and patient since the distro is aimed at newbies. LinuxMusicians is a nice forum, and not so distro-specific, but I've noticed that they tend to get bogged down in the "why" and not the "how" on occasion. Really, other than Phoronix and the LKML, the Linux community in general is pretty cool, just a few loud voices give us a bad rap for being too insular, but that's changing pretty quickly.