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Ok, I’m confused. Do you take notes in Obsidian or in Zettelkasten? Or both?

Zettelkasten is a methodology, Obsidian is an app

Thank you.

Did you use any particular book or blog post when mapping the method to the app? I've found one book, but not sure if good https://www.amazon.com/How-Take-Smart-Notes-Obsidian-ebook/d...