Typically one puts in information about their path, their experiences, their workings, you can also add reference materials that you would like to have on hand, spells you have done, spells you would like to try, rituals, tools, items you have used and how you feel about them, forms of divination, readings from divination, moon phases and what they mean to you, days you celebrate, book titles you have read and if they helped, etc.
You can put what you want in the book.
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