— name: seo-fundamentals description: Core principles of SEO including E-E-A-T, Core Web Vitals, technical foundations, content quality, and how modern search engines evaluate pages. risk: safe source: community date_added: '2026-02-27' — — # SEO Fundamentals > **Foundational principles for sustainable search visibility.** > This skill explains _how search engines evaluate quality_, not tactical shortcuts. — ## 1. E-E-A-T (Quality Evaluation Framework) E-E-A-T is **not a direct ranking factor**. It is a framework used by search engines to **evaluate content quality**, especially for sensitive or high-impact topics. | Dimension | What It Represents | Common Signals | | ——————— | ———————————- | ————————————————— | | **Experience** | First-hand, real-world involvement | Original examples, lived experience, demonstrations | | **Expertise** | Subject-matter competence | Credentials, depth, accuracy | | **Authoritativeness** | Recognition by others | Mentions, citations, links | | **Trustworthiness** | Reliability and safety | HTTPS, transparency, accuracy | > Pages competing in the same space are often differentiated by **trust and experience**, not keywords. — ## 2. Core Web Vitals (Page Experience Signals) Core Web Vitals measure **how users experience a page**, not whether it deserves to rank. | Metric | Target | What It Reflects | | ——- | ——- | ——————- | | **LCP** | < 2.5s | Loading performance | | **INP** | < 200ms | Interactivity | | **CLS** | < 0.1 | Visual stability | **Important context:** – CWV rarely override poor content – They matter most when content quality is comparable – Failing CWV can _hold back_ otherwise good pages — ## 3. Technical SEO Principles Technical SEO ensures pages are **accessible, understandable, and stable**. ### Crawl & Index Control | Element | Purpose | | —————– | ———————- | | XML sitemaps | Help discovery | | robots.txt | Control crawl access | | Canonical tags | Consolidate duplicates | | HTTP status codes | Communicate page state | | HTTPS | Security and trust | ### Performance & Accessibility | Factor | Why It Matters | | ———————- | —————————– | | Page speed | User satisfaction | | Mobile-friendly design | Mobile-first indexing | | Clean URLs | Crawl clarity | | Semantic HTML | Accessibility & understanding | — ## 4. Content SEO Principles ### Page-Level Elements | Element | Principle | | —————- | —————————- | | Title tag | Clear topic + intent | | Meta description | Click relevance, not ranking | | H1 | Page’s primary subject | | Headings | Logical structure | | Alt text | Accessibility and context | ### Content Quality Signals | Dimension | What Search Engines Look For | | ———– | —————————- | | Depth | Fully answers the query | | Originality | Adds unique value | | Accuracy | Factually correct | | Clarity | Easy to understand | | Usefulness | Satisfies intent | — ## 5. Structured Data (Schema) Structured data helps search engines **understand meaning**, not boost rankings directly. | Type | Purpose | | ————– | ———————- | | Article | Content classification | | Organization | Entity identity | | Person | Author information | | FAQPage | Q&A clarity | | Product | Commerce details | | Review | Ratings context | | BreadcrumbList | Site structure | > Schema enables eligibility for rich results but does not guarantee them. — ## 6. AI-Assisted Content Principles Search engines evaluate **output quality**, not authorship method. ### Effective Use – AI as a drafting or research assistant – Human review for accuracy and clarity – Original insights and synthesis – Clear accountability ### Risky Use – Publishing unedited AI output – Factual errors or hallucinations – Thin or duplicated content – Keyword-driven text with no value — ## 7. Relative Importance of SEO Factors There is **no fixed ranking factor order**. However, when competing pages are similar, importance tends to follow this pattern: | Relative Weight | Factor | | ————— | ————————— | | Highest | Content relevance & quality | | High | Authority & trust signals | | Medium | Page experience (CWV, UX) | | Medium | Mobile optimization | | Baseline | Technical accessibility | > Technical SEO enables ranking; content quality earns it. — ## 8. Measurement & Evaluation SEO fundamentals should be validated using **multiple signals**, not single metrics. | Area | What to Observe | | ———– | ————————– | | Visibility | Indexed pages, impressions | | Engagement | Click-through, dwell time | | Performance | CWV field data | | Coverage | Indexing status | | Authority | Mentions and links | — > **Key Principle:** > Sustainable SEO is built on _useful content_, _technical clarity_, and _trust over time_. > There are no permanent shortcuts. ## When to Use This skill is applicable to execute the workflow or actions described in the overview. ## Limitations – Use this skill only when the task clearly matches the scope described above. – Do not treat the output as a substitute for environment-specific validation, testing, or expert review. – Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.