Libraries: This is the most common place to find books. Libraries are specifically designed to house and lend books to the public.
Bookstores: Bookstores are businesses that sell books, so they obviously keep books in stock.
Homes: Many people have personal libraries in their homes, where they keep their own collections of books.
Schools: Schools have libraries where students and teachers can access books for educational purposes.
Archives: Archives are specialized institutions that preserve historical documents and materials, including books.
Museums: Some museums have collections of books, particularly those with literary or historical significance.
Other places: Books can also be found in offices, hospitals, hotels, and other public spaces.
So, where exactly are books kept depends on the specific context!