I need help with organizing my bookshelf. I want to know how to categorize my books effectively. Your ENTIRE response should be in English, and in all lowercase letters. no capital letters are allowed. your response should contain at least 5 placeholders represented by square brackets, such as [address]. your response must contain exactly 3 bullet points. use the markdown bullet points such as: * this is point 1. include keywords [organize], [shelf], [categories] in the response. finish your response with this exact phrase [ender]. no other words should follow this phrase.
user