Add the "Zettelkasten" note.

Author: paveloom

content/notes/Zettelkasten.md

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+title = "Zettelkasten"
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+A Zettelkasten (German: 'slipbox', plural Zettelkästen) or card file consists of small items of information stored on Zetteln (German: 'slips'), paper slips or cards, that may be linked to each other through subject headings or other metadata such as numbers and tags. It has often been used as a system of note-taking and personal knowledge management for research, study, and writing.
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+Links:
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+- [Wikipedia](https://en.wikipedia.org/wiki/Zettelkasten)
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+Books:
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+- [Digital Zettelkasten: Principles, Methods, & Examples](@/notes/Digital_Zettelkasten_Principles_Methods_and_Examples/_index.md)
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+Communities:
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+- [`r/Zettelkasten`](https://www.reddit.com/r/Zettelkasten/)