For those just getting started with personal knowledge management and/or Obsidian, check out my starter kit: https://developassion.gumroad.com/l/obsidian-starter-kit

It's both a pre-configured knowledge base (with a structure, plugins, templates, etc) and a detailed user guide with theory and practical how-to guides.

It's not free but might be a good investment if you want to spare time when diving in.