No hreflang tags — international or regional targeting not declared

Hreflang tags are small pieces of code that tell search engines which language and region a particular page is intended for — for example, English for Australia versus English for the UK. Without hreflang tags, search engines may serve the wrong version of your pages to users in different countries, splitting your search authority and reducing your rankings in each regional market you are trying to reach. If your site targets multiple countries or languages, ask your developer to add hreflang tags to each page specifying the intended region. If your site is single-language and single-region only, this may not apply to you.