Google Search Central - Official SEO Documentation

URL: https://developers.google.com/search/docs

Google's official documentation for webmasters and developers on content quality guidelines, indexing, structured data, Core Web Vitals, robots.txt, sitemaps and Search Console. Primary normative source for SEO best practices. Proprietary Google content - paraphrased and cited, not reproduced verbatim.

Google Search Central Blog

URL: https://developers.google.com/search/blog

Official blog of the Google Search team with announcements of algorithm updates, new SERP features and technical guides. Primary source for information on algorithm changes and ranking factor updates. Proprietary Google content - paraphrased and cited.

URL: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32016R0679

Full text of the General Data Protection Regulation (GDPR). Licence CC-BY-4.0 (EU Publications Office - EUR-Lex reuse policy). Used as a descriptive reference for data protection principles applicable to digital marketing (Arts. 5, 6, 7, 13, 14). No extended verbatim text; citations by article number.

URL: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32002L0058

Text of the ePrivacy Directive (Cookie Directive), governing the processing of personal data and protection of privacy in electronic communications, including cookies and tracking technologies. Licence CC-BY-4.0. Cited as descriptive reference; no legal advice.

web.dev - Core Web Vitals

URL: https://web.dev/articles/vitals

Google/web.dev technical documentation on LCP, INP and CLS: definitions, thresholds, measurement methods, optimisation tools. Licence CC-BY-4.0. Primary source for user experience metrics in the SEO context.

Google PageSpeed Insights

URL: https://pagespeed.web.dev/

Official Google tool for measuring Core Web Vitals and web page performance, with lab data (Lighthouse) and real user data (Chrome User Experience Report - CrUX). Reference source for frontend performance diagnosis.

schema.org - Vocabulary for Structured Data

URL: https://schema.org/

Shared vocabulary for structured data supported by Google, Bing, Yahoo and Yandex. Licence CC-BY-SA 4.0. Defines types and properties usable in JSON-LD markup for rich results in the SERP.

Marketing Metric Definitions (Investopedia - paraphrased)

URL: https://www.investopedia.com/

Reference definitions for marketing metrics including CPA, CAC, ROAS, ROI and LTV. Proprietary content - paraphrased with original wording; not reproduced verbatim. Used to disambiguate CPA vs. CAC and ROAS vs. ROI.