Within the pantheon of types of notes there are: - paraphrasing notes, which one can use to summarize ideas for later recall and review as well as to check one's own knowledge and understanding of what an author has said. - commentary notes, which take the text and create a commentary on them, often as part of having a conversation with the text. These can be seen historically in the Midrashim tradition of commenting on Torah.

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separately also: - productivity notes - to do lists, reminders of work to be done, often within or as part of a larger complex project