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The title meta tag is the title of the web page. In the search results, the title is displayed as a large blue link, and when you open the page, it is visible in the title of the browser tab. It must appear on all pages of the site. If there is no page title, the URL of the page will be shown instead.
An EXAMPLE of adding / changing a Title, you can study here: https://solomono.net/en/nastrojka-title-a-411.html