# seo-fundamentals

Explains search optimization principles: E-E-A-T, Core Web Vitals, technical foundations, content structure. Helps review pages and improve their visibility.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 1100 installs · ★ 48508
- Author: sickn33
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/sickn33/agentic-awesome-skills/tree/HEAD/skills/seo-fundamentals/SKILL.md
- Updated: 2026-10-24
- HTML: https://affpapa.org/en/nevibecode/skills/sickn33-seo-fundamentals

## What it does

Teaches the agent to evaluate page quality using the E-E-A-T framework (experience, expertise, authoritativeness, trust), check Core Web Vitals metrics (LCP, INP, CLS), configure technical accessibility (sitemaps, robots.txt, canonical tags, HTTPS), improve content structure (headings, meta tags, semantic HTML), and work with structured data. Includes `seo_checker.py`, which audits up to 50 files and provides recommendations.

The script cannot verify rendered metadata or certify indexability, which is a reason to cross-check against live pages and current search engine documentation. Empty alt text can correctly mark decorative images. A no-file result does not mean everything passed.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add sickn33/agentic-awesome-skills --skill seo-fundamentals -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/seo-fundamentals/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/seo-fundamentals/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add sickn33/agentic-awesome-skills --skill seo-fundamentals -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/seo-fundamentals/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add sickn33/agentic-awesome-skills --skill seo-fundamentals -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/seo-fundamentals/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install sickn33/agentic-awesome-skills seo-fundamentals
```

2. **Manually: put the files in place**
- File: `.github/skills/seo-fundamentals/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add sickn33/agentic-awesome-skills --skill seo-fundamentals -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/sickn33/agentic-awesome-skills --path skills/seo-fundamentals
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/seo-fundamentals/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add sickn33/agentic-awesome-skills --skill seo-fundamentals -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/sickn33/agentic-awesome-skills/tree/HEAD/skills/seo-fundamentals/SKILL.md

## When to use it
- check pages for E-E-A-T compliance
- evaluate Core Web Vitals and spot bottlenecks
- improve content structure for indexing
- configure Schema semantic markup
- audit technical accessibility and canonicalization

## Example prompts
- Review this landing page with @seo-fundamentals and show the main issues
- Evaluate Core Web Vitals for the homepage and suggest fixes
- Improve meta tags and heading structure using @seo-fundamentals principles

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: b8e7f716d937fd23.

BEGIN THIRD-PARTY FILE b8e7f716d937fd23
```text
---
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                    |
```
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