The Book of Shadows is primarily a witch’s diary. It is where he or she records spells, recipes and thoughts and dreams, it is, in essence, one’s very own, unique, personalized and sacred grimoire, an ever-evolving, encyclopedia, how-to guide, recipe book, and personal journal.
In families of Hereditary traditions, The Book of Shadows may be passed down through generations and contain messages of wisdom, family traditions, age-old spells & Old Wives Tales, among the rest of its contents.
Some covens or circles have a Book of Shadows the whole group shares, unlike the individual versions, the Coven’s Book Of Shadows generally focuses more on outlining the core beliefs, ethics, ritual practice, and initiatory records than the personal evolution ones own private Book contains.
For more information see: How to Create Your Own Book of Shadows