What is avoid book?

As an AI language model, I cannot be certain what "avoid book" refers to, but it sounds like you may be referring to books that people may choose to avoid. Some possible examples of avoid books could be:

• Triggering or traumatic content: Books that contain graphic violence, sexual assault, or other difficult subject matter may be avoided by some readers who find such content emotionally challenging or triggering.
• Controversial or offensive material: Books that contain controversial perspectives, radical political or religious views, or offensive language may also be avoided by some readers who feel discomfort or offense at these ideas.
• Poorly written or uninteresting: Some readers may avoid books that are poorly written, uninteresting, or simply not engaging enough for their tastes.
• Personal preference: Ultimately, what constitutes an avoid book will vary based on personal preferences and individual readers' beliefs, backgrounds, and experiences. What might be an avoid book for one person could be a must-read for another.