Theory
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Common cases
Document mutations
Pages with a broken canonical link
Broken external images
Broken external link
Broken internal images
Broken internal links
Issues with duplicate title tags
Pages with duplicate meta descriptions first
Pages with duplicate meta descriptions second
Pages with duplicate H1 and title tags
Pages with duplicate H1 and title tags
Issues with duplicate title tags
Issues with duplicate title tags
Links on HTTPS pages leading to HTTP page
Pages have a low word count
Links with no anchor text
Outgoing external links containing no follow attributes
Pages don't have title tags
Links with non-descriptive anchor text
Pages with too much text within the title tags
Pages without enough text within the title tags
Pages without meta descriptions