The `<title>` tag significantly impacts user experience and search engine optimization, providing context, influencing click-through rates, setting expectations, and helping users identify tabs. Best practices include keeping it concise (55-60 characters), descriptive, unique, and using branding wisely to improve SEO and UX.
Canonical URLs help avoid duplicate content issues by specifying the preferred version of a webpage that search engines should index and display, using the `rel="canonical"` attribute to concentrate link equity on one page and improve user experience.
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