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Canonical Tag Usability

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Canonical tag is part of website to avoid duplicate contents issue ..... Best example is your website homepage
As example your website can open with both below URL.
Buy Seo Manual Submission Services & Buy Seo Manual Submission Services
And search engine's bot can read both so to avoid duplication you can add canonical tag at homepage like
<link rel="canonical" href="https://www.seomanualsubmission.com" />
So search engine can understand easily that main page is canonical URL. To read in details check our tutorial What is canonical tag?