foundation

SEO basics

Metadata, canonical URLs, Open Graph, structured data, crawlable links, and meaningful page structure.

SEO interviews in the HTML layer focus on crawlability, accurate previews, and truthful metadata — not keyword stuffing. Unique titles and descriptions, canonical URLs, robots hints, Open Graph/Twitter cards, and structured data should match visible content.

Subtopics: meta tags and social previews; JSON-LD structured data for articles, products, breadcrumbs, and FAQs.

On interviews: separate ranking myths from crawl/index mechanics and canonicalization.

Common pitfalls: duplicate titles; misleading OG images; blocking important pages with robots tags.

Checklist:

Unique titles and descriptions per URL.
Canonical URLs for duplicates.
Accurate social preview metadata.
Structured data mirrors visible facts.