What is hreflang and when do you use it?

<link rel="alternate" hreflang="en" href="https://example.com/guide/">
<link rel="alternate" hreflang="fr" href="https://example.com/fr/guide/">
<link rel="alternate" hreflang="x-default" href="https://example.com/guide/">

Each version must list all versions including itself, and the links must be reciprocal. See International SEO and Hreflang.

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