1. The canonical tag specifies the preferred version of a landing page when multiple versions with similar content exist (e.g., different URLs). It helps search engines identify the original source of content and avoid duplicate content issues.
2. The viewport meta tag defines how the landing page should be displayed and scaled on mobile devices. It ensures a consistent user experience across different screen sizes and resolutions by adjusting the viewport width and initial scale.
3. Open Graph tags are meta tags that provide structured data about the landing page's content when shared on social media platforms like Facebook, Twitter, and LinkedIn. They include information such as the page title, description, image, and type, enhancing the appearance of shared links and increasing engagement.

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