These books are great for learning about various topics. To use them, simply open the book to the topic you're interested in and start reading. The bright illustrations will make your learning experience more engaging. When handling the books, try to keep your hands clean to avoid further soiling. Since the spine ends have some damage, be gentle when opening and closing the books to prevent more wear. Store them in a dry and cool place to maintain their condition. You can use bookmarks to mark your favorite pages, but don't fold the pages as it might cause damage. Enjoy exploring the wonderful knowledge inside these books!