If you want a DAW with bigger community and a lot of tutorials then obviously you could go with FL Studio or Ableton on Windows/macOS (or maybe you could try to run those with Wine), but on Linux it seems that Ardour is the most popular one. Most tutorials should be quite easily applicable to other DAWs/plugins though, you will just need to put a little more effort into it, but I guess it also means you would learn more. So I wouldn’t care about DAWs too much, because it doesn’t really matter and it’s obviously kinda hot topic in music-making community (just like which distro topics in Linux community haha). Just play with some of them and pick whichever you like the most. Maybe later you will feel that your DAW limits you in some way, but then you will already know what to look for.
Regarding learning resources, just off the top of my head I would recommend watching some videos of unfa. It is a really good channel about making some music on Linux. There are probably some more channels that focus on that too, but I don’t really remember any right now. There are also sites like linuxmusicians.com and linuxaudio.org that may be helpful, especially when looking for plugins and stuff like that. And there are some related communities back on Reddit. Other than that I’d just go and watch some “general” tutorials, e.g. how to make bassline, how to make kick, and try to adapt them to your Linux workflow, as I said earlier, and just try and have fun.