What is H1 Tag?
The page’s primary heading naming its topic. Exactly one per page, matching search intent; everything else nests below it in the heading hierarchy.
Related terms
Heading Hierarchy
The nested H1→H2→H3 outline of a page. A clean hierarchy lets readers scan and lets parsers chunk sections accurately for retrieval and snippets.
Title Tag
The clickable headline in search results and the strongest on-page relevance signal. Google rewrites most titles, so clarity and completeness beat rigid length rules.
Semantic HTML
Using main, nav, header, article, and proper headings so assistive tech and parsers understand page structure. The foundation of both accessibility and machine readability.
On-Page SEO
Optimizing individual pages: titles, headings, content depth, internal links, images, and schema. On-page work decides relevance once technical SEO has made the page reachable.
Meta Description
The optional summary that can become the result snippet. Absence is not a penalty and Google rewrites most descriptions, so prioritize valuable pages where controlled wording earns clicks.
Topic Cluster
A pillar page surrounded by interlinked subtopic pages. Clusters make coverage legible to crawlers and readers at once, and internal links bind them into one structure.