There are numerous methods for note-taking nowadays. Whether you use DEVONthink, Craft, Notion, Roam, Apple Notes, or Obsidian.
Learning to use any one of these takes time. David has always been excellent about taking the user from basics through advanced usage in any of his field guides. His latest on Obsidian is no different. Well made and easy to follow.
If you're interested, check out his latest field guide on Obsidian!
