Shadows is right, except for the book of shadows thing.
You can create your own grimoire. Book of shadows is just another term, a fairly recent term, that was first applied to a personal book of spells by Gardner.
Grimoire just means a "book of magick" and has meant so for at least 300 years.
Nowadays people use their book of shadows/grimoire for containing their own personal spells, and reference material for future spell writing instead of writing it like a magickal manual as they used to in the past.