Library school is where people go to learn how to be really good at working in a library. It's like a special school for grown-ups where they learn all about books, and how to help people find the books they're looking for. They also learn how to organize the library, make sure all the books are in the right place, and how to take care of them so they last a long time. They even learn how to use computers to help people find information. It's kind of like being a superhero for books!