19.- Hreflang conflicts with the page source code
Multilingual websites can confuse search engines if the hreflang attribute conflicts with the source code of the pages.
20.- Problems with incorrect hreflang links
Broken hreflang links can create indexing issues if, for example, relative URLs are used instead of absolute ones:
21.-
The Site Audit tool can flag pages that lack content, so it's worth reviewing them to make sure they're as informative as possible.
22.- Lost hreflang and lang attributes
This problem occurs when a page on a multilingual website lacks france mobile database the necessary links or tags to tell search engines what to offer to users in each region.
Learn more about hreflang here.
23.- HTML problems with AMP
This issue concerns mobile users of your website, and appears when the HTML code does not comply with AMP standards (article in English).
Other common indexability mistakes include:
Duplicate H1 tags.
Duplicate content.
Duplicate title tags.
Duplicate meta descriptions.
Lack of H1 tags.
Multiple H1 tags.
Hreflang language mismatch issues.
Forget mobile page acceleration with AMP
SEO Mistakes - AMP Mobile Pages Infographic
It is very important to adapt the SEO of your website pages to mobile devices.
We already know that mobile-friendliness will be the default ranking criterion for mobile and desktop for Google in September 2020 (article in English).
This means that as a webmaster, you must ensure that your site's HTML code complies with Google's AMP guidelines before September.
This will help you avoid potential damage to your search performance.