Notebooks
Plain Text Format
Also see: personal knowledge management and LaTeX.
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If you're putting effort into writing your own notes, consider not locking them in a proprietary format like Word or Google Doc. Instead, use plain text format such as markdown or LaTeX.
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See Why Plain Text Matters and The Unreasonable Effectiveness Of Plain Text (business perspective)
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Software: I recommend Obsidian: it's free and has a large community of users.