Comment by adamhp

There is a ton of content about Obsidian! Also it's a fairly intuitive interface. I'd just download it and start messing around, then check out the community plugins. If you really want to dig into notes systems, then you can Google PARA or Zettelkasten, but to me, that quickly begins to devolve into homework and needless learning curves. Just bolt on what you need it for. It's very full featured and if you feel like you're missing something, just search for a plugin.