Select a language and optionally a country to generate the appropriate hreflang tag values.
hreflang value
en
hreflang tag in <head>
<link rel="alternate" hreflang="en" href="https://example.com/en/" />
hreflang tag in sitemap.xml
<xhtml:link rel="alternate" hreflang="en" href="https://example.com/en/" />