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First read to your kid. Fill your house with books and let them know by example that they are fun and important.

The other advice I'd have is to take your kid to the library once a week. Let them pick out a couple books (maybe also pick up one your choosing so that you can expose them to more things - kids can be obsessive) Once they can manage a chapter book tell them they are allowed to pick whatever books they like from anywhere in the entire library. Kids love having choice and flexing agency. Don't worry if they pick up something too mature/scary/boring/whatever. Anything they want to pick really is fine, but if they don't like it they'll have to wait until next week to swap it out.

Get them their own library card as soon as you can too. Make a big deal of it. Having an official document for access to the books highlights the importance of them too.