SEO Fundamentals

1---
2name: seo-fundamentals
3description: >
4  Core principles of SEO including E-E-A-T, Core Web Vitals, technical foundations,
5  content quality, and how modern search engines evaluate pages. This skill explains
6  *why* SEO works, not how to execute specific optimizations.
7allowed-tools: Read, Glob, Grep
8---
9 
10---
11 
12# SEO Fundamentals
13 
14> **Foundational principles for sustainable search visibility.**
15> This skill explains _how search engines evaluate quality_, not tactical shortcuts.
16 
17---
18 
19## 1. E-E-A-T (Quality Evaluation Framework)
20 
21E-E-A-T is **not a direct ranking factor**.
22It is a framework used by search engines to **evaluate content quality**, especially for sensitive or high-impact topics.
23 
24| Dimension             | What It Represents                 | Common Signals                                      |
25| --------------------- | ---------------------------------- | --------------------------------------------------- |
26| **Experience**        | First-hand, real-world involvement | Original examples, lived experience, demonstrations |
27| **Expertise**         | Subject-matter competence          | Credentials, depth, accuracy                        |
28| **Authoritativeness** | Recognition by others              | Mentions, citations, links                          |
29| **Trustworthiness**   | Reliability and safety             | HTTPS, transparency, accuracy                       |
30 
31> Pages competing in the same space are often differentiated by **trust and experience**, not keywords.
32 
33---
34 
35## 2. Core Web Vitals (Page Experience Signals)
36 
37Core Web Vitals measure **how users experience a page**, not whether it deserves to rank.
38 
39| Metric  | Target  | What It Reflects    |
40| ------- | ------- | ------------------- |
41| **LCP** | < 2.5s  | Loading performance |
42| **INP** | < 200ms | Interactivity       |
43| **CLS** | < 0.1   | Visual stability    |
44 
45**Important context:**
46 
47- CWV rarely override poor content
48- They matter most when content quality is comparable
49- Failing CWV can _hold back_ otherwise good pages
50 
51---
52 
53## 3. Technical SEO Principles
54 
55Technical SEO ensures pages are **accessible, understandable, and stable**.
56 
57### Crawl & Index Control
58 
59| Element           | Purpose                |
60| ----------------- | ---------------------- |
61| XML sitemaps      | Help discovery         |
62| robots.txt        | Control crawl access   |
63| Canonical tags    | Consolidate duplicates |
64| HTTP status codes | Communicate page state |
65| HTTPS             | Security and trust     |
66 
67### Performance & Accessibility
68 
69| Factor                 | Why It Matters                |
70| ---------------------- | ----------------------------- |
71| Page speed             | User satisfaction             |
72| Mobile-friendly design | Mobile-first indexing         |
73| Clean URLs             | Crawl clarity                 |
74| Semantic HTML          | Accessibility & understanding |
75 
76---
77 
78## 4. Content SEO Principles
79 
80### Page-Level Elements
81 
82| Element          | Principle                    |
83| ---------------- | ---------------------------- |
84| Title tag        | Clear topic + intent         |
85| Meta description | Click relevance, not ranking |
86| H1               | Page’s primary subject       |
87| Headings         | Logical structure            |
88| Alt text         | Accessibility and context    |
89 
90### Content Quality Signals
91 
92| Dimension   | What Search Engines Look For |
93| ----------- | ---------------------------- |
94| Depth       | Fully answers the query      |
95| Originality | Adds unique value            |
96| Accuracy    | Factually correct            |
97| Clarity     | Easy to understand           |
98| Usefulness  | Satisfies intent             |
99 
100---
101 
102## 5. Structured Data (Schema)
103 
104Structured data helps search engines **understand meaning**, not boost rankings directly.
105 
106| Type           | Purpose                |
107| -------------- | ---------------------- |
108| Article        | Content classification |
109| Organization   | Entity identity        |
110| Person         | Author information     |
111| FAQPage        | Q&A clarity            |
112| Product        | Commerce details       |
113| Review         | Ratings context        |
114| BreadcrumbList | Site structure         |
115 
116> Schema enables eligibility for rich results but does not guarantee them.
117 
118---
119 
120## 6. AI-Assisted Content Principles
121 
122Search engines evaluate **output quality**, not authorship method.
123 
124### Effective Use
125 
126- AI as a drafting or research assistant
127- Human review for accuracy and clarity
128- Original insights and synthesis
129- Clear accountability
130 
131### Risky Use
132 
133- Publishing unedited AI output
134- Factual errors or hallucinations
135- Thin or duplicated content
136- Keyword-driven text with no value
137 
138---
139 
140## 7. Relative Importance of SEO Factors
141 
142There is **no fixed ranking factor order**.
143However, when competing pages are similar, importance tends to follow this pattern:
144 
145| Relative Weight | Factor                      |
146| --------------- | --------------------------- |
147| Highest         | Content relevance & quality |
148| High            | Authority & trust signals   |
149| Medium          | Page experience (CWV, UX)   |
150| Medium          | Mobile optimization         |
151| Baseline        | Technical accessibility     |
152 
153> Technical SEO enables ranking; content quality earns it.
154 
155---
156 
157## 8. Measurement & Evaluation
158 
159SEO fundamentals should be validated using **multiple signals**, not single metrics.
160 
161| Area        | What to Observe            |
162| ----------- | -------------------------- |
163| Visibility  | Indexed pages, impressions |
164| Engagement  | Click-through, dwell time  |
165| Performance | CWV field data             |
166| Coverage    | Indexing status            |
167| Authority   | Mentions and links         |
168 
169---
170 
171> **Key Principle:**
172> Sustainable SEO is built on _useful content_, _technical clarity_, and _trust over time_.
173> There are no permanent shortcuts.
174