Multilanguage Wordpress site

Hello!

This is my first post. I'm looking for help on a multilingual version of wordpress.

Please tell me how this is done? Do I need to add any plugins to have additional languages besides English in my wordpress?

I've seen that there are even language switching buttons on some sites. I am keen to add Spanish to the site.

Can I handle this myself or do I need to hire a freelancer?

I read somewhere that there is a Polylang plugin, but I don't know exactly if it will work for me.

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