Language tags for multilingual pages
If your site has the same page in Hindi and English (or other languages), hreflang tags tell Google which version to show to which searcher. Add each language version and the x-default page to get the correct tags for your page head or sitemap.
Yes. Every language version must list all versions, including itself, or Google may ignore them.
Use “hi” for Hindi in general; add a region (hi-in) only if you have different pages for different countries.
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