Hreflang
Markup identifying alternative language or regional versions. It should point to genuine equivalents with reciprocal consistency; it does not translate content automatically.
Definition and sourcesKNOWLEDGE / FROM A TO Z
Glossary
Technology, explained clearly. Find a term, choose a letter or narrow the topic. Definitions include sources and their review date.
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Clear filtersHTML headings
The h1–h6 elements express content hierarchy, not font size. One principal h1 is a clear editorial convention. The number of h1 elements is not a simple Google ranking rule.
Definition and sourcesHTML title element
An imprecise colloquial name for HTML's title element, not a meta tag. It names the page; Google may generate a different result title.
Definition and sources