Libraries are a great benefit to writers everywhere.
Way back in the mists of pre-Internet history, libraries were the just about the ONLY places you could locate books that were no longer for sale.
Today, when people can download or order practically any book online, physical("meatspace") libraries are still an asset to writers. The library is often where people first come in contact with books - a loyal following of readers might be born there - and each library copy is read several times by different people.
Librarians can spread good (or bad) word-of-mouth about books, invaluable to writers. So support your local library!
If you have just released your first novel, you should donate a copy of it to your neighborhood library.
Ask your library if they are interested in arranging a meet-the-readers session, where you can get the opportunity to read from your novel/book and generate PR.
But be polite! You must never cross a librarian, or THIS might happen to you...