Everyone has a vested interest in their receiving preservation education programs at an early age. The first person who has to learn good preservation technique is the school librarian. Students are notoriously good at mimicry, and what they see the adult do is what they will learn. Always model good behavior. Why Make sure your hands are clean.
Dirt is hard to remove.
An unattractive book seems less deserving of careful handling. Gently set the crease in when you open the book. The book will open better and the binding will remain flexible and not crack. When reading aloud, cup the book in your palm instead of doubling back the cover. The cover will stay attached to the book.