Multilanguage site

Hi! I have a website in english and I want to translate it in French But I don’t know how to add a new language. Do I have to translate every post or page?
Can you please help me?

Hello @pop_ksidou,

You can translate your website with Polylang plugin.

Please visit this page for more details.

Kind Regards, Roman.

P. S.
Also you can read this WordPress Codex page.