ruanmalvao-web/seo-fundamentals

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SEO Fundamentals

Foundational principles for sustainable search visibility. This skill explains how search engines evaluate quality, not tactical shortcuts.

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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.

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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

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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 |

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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 |

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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.

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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

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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.

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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 |

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Key Principle: Sustainable SEO is built on useful content, technical clarity, and trust over time. There are no permanent shortcuts.