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Skill: SEO Audit for Concept Pages

Use this skill to perform a focused SEO audit on concept documentation pages for the 33 JavaScript Concepts project. The goal is to maximize search visibility for JavaScript developers.

When to Use

• Before publishing a new concept page
• When optimizing underperforming pages
• Periodic content audits
• After major content updates
• When targeting new keywords

Goal

Each concept page should rank for searches like:

• "what is [concept] in JavaScript"
• "how does [concept] work in JavaScript"
• "[concept] JavaScript explained"
• "[concept] JavaScript tutorial"
• "[concept] JavaScript example"

SEO Audit Methodology

Follow these five steps for a complete SEO audit.

Step 1: Identify Target Keywords

Before auditing, identify the keyword cluster for the concept.

Keyword Cluster Template

Step 2: On-Page SEO Audit

Check all on-page SEO elements systematically.

Step 3: Featured Snippet Optimization

Verify content is structured to win featured snippets.

Step 4: Internal Linking Audit

Check the internal link structure.

Step 5: Generate Report

Document findings using the report template.

Keyword Clusters by Concept

Use these pre-built keyword clusters for each concept.

Audit Checklists

Title Tag Checklist (4 points)

| Check | Points | How to Verify

---|---|---|---
1 | Length 50-60 characters | 1 | Count characters in title frontmatter
2 | Primary keyword in first half | 1 | Concept name appears early
3 | Ends with "in JavaScript" | 1 | Check title ending
4 | Contains compelling hook | 1 | Promises value/benefit to reader

Scoring:

• 4/4: ✅ Excellent
• 3/4: ⚠️ Good, minor improvements possible
• 0-2/4: ❌ Needs significant work

Title Formula:

[Concept]: [What You'll Understand] in JavaScript

Good Examples:

Bad Examples:

Meta Description Checklist (4 points)

| Check | Points | How to Verify

---|---|---|---
1 | Length 150-160 characters | 1 | Count characters in description frontmatter
2 | Starts with action word | 1 | "Learn", "Understand", "Discover" (NOT "Master")
3 | Contains primary keyword | 1 | Concept name + "JavaScript" present
4 | Promises specific value | 1 | Lists what reader will learn

Description Formula:

[Action word] [what it is] in JavaScript. [Specific things they'll learn]: [topic 1], [topic 2], and [topic 3].

Good Examples:

Bad Examples:

Keyword Placement Checklist (5 points)

| Check | Points | How to Verify

---|---|---|---
1 | Primary keyword in title | 1 | Check frontmatter title
2 | Primary keyword in meta description | 1 | Check frontmatter description
3 | Primary keyword in first 100 words | 1 | Check opening paragraphs
4 | Keyword in at least one H2 heading | 1 | Scan all ## headings
5 | No keyword stuffing | 1 | Content reads naturally

Keyword Placement Map:

┌─────────────────────────────────────────────────────────────────────────┐
│                         KEYWORD PLACEMENT                                │
├─────────────────────────────────────────────────────────────────────────┤
│                                                                          │
│  🔴 CRITICAL (Must have keyword)                                         │
│  ─────────────────────────────────                                       │
│  • title frontmatter                                                     │
│  • description frontmatter                                               │
│  • First paragraph (within 100 words)                                    │
│  • At least one H2 heading                                               │
│                                                                          │
│  🟡 RECOMMENDED (Include naturally)                                      │
│  ──────────────────────────────────                                      │
│  • "What you'll learn" Info box                                          │
│  • H3 subheadings                                                        │
│  • Key Takeaways section                                                 │
│  • First sentence after major H2s                                        │
│                                                                          │
│  ⚠️ AVOID                                                                │
│  ─────────                                                               │
│  • Same phrase >4 times per 1000 words                                   │
│  • Forcing keywords where pronouns work better                           │
│  • Awkward sentence structures to fit keywords                           │
│                                                                          │
└─────────────────────────────────────────────────────────────────────────┘

Content Structure Checklist (6 points)

| Check | Points | How to Verify

---|---|---|---
1 | Opens with question hook | 1 | First paragraph asks engaging question
2 | Code example in first 200 words | 1 | Simple example appears early
3 | "What you'll learn" Info box | 1 | <Info> component after opening
4 | Short paragraphs (2-4 sentences) | 1 | Scan content for long blocks
5 | 1,500+ words | 1 | Word count check
6 | Key terms bolded on first mention | 1 | Important terms use **bold**

Content Structure Template:

┌─────────────────────────────────────────────────────────────────────────┐
│                       IDEAL PAGE STRUCTURE                               │
├─────────────────────────────────────────────────────────────────────────┤
│                                                                          │
│  1. QUESTION HOOK (First 50 words)                                       │
│     "How does JavaScript...? Why do...?"                                 │
│                                                                          │
│  2. BRIEF ANSWER + CODE EXAMPLE (Words 50-200)                           │
│     Quick explanation + simple code demo                                 │
│                                                                          │
│  3. "WHAT YOU'LL LEARN" INFO BOX                                         │
│     5-7 bullet points                                                    │
│                                                                          │
│  4. PREREQUISITES WARNING (if applicable)                                │
│     Link to required prior concepts                                      │
│                                                                          │
│  5. MAIN CONTENT SECTIONS (H2s)                                          │
│     Each H2 answers a question or teaches a concept                      │
│     Include code examples, diagrams, tables                              │
│                                                                          │
│  6. COMMON MISTAKES / GOTCHAS SECTION                                    │
│     What trips people up                                                 │
│                                                                          │
│  7. KEY TAKEAWAYS                                                        │
│     8-10 numbered points summarizing everything                          │
│                                                                          │
│  8. TEST YOUR KNOWLEDGE                                                  │
│     5-6 Q&A accordions                                                   │
│                                                                          │
│  9. RELATED CONCEPTS                                                     │
│     4 cards linking to related topics                                    │
│                                                                          │
│  10. RESOURCES (Reference, Articles, Videos)                             │
│      MDN links, curated articles, videos                                 │
│                                                                          │
└─────────────────────────────────────────────────────────────────────────┘

Featured Snippet Checklist (4 points)

| Check | Points | How to Verify

---|---|---|---
1 | "What is X" has 40-60 word definition | 1 | Count words in first paragraph after "What is" H2
2 | At least one H2 is phrased as question | 1 | Check for "What is", "How does", "Why" H2s
3 | Numbered steps for "How to" content | 1 | Uses <Steps> component or numbered list
4 | Comparison tables (if applicable) | 1 | Tables for "X vs Y" content

Featured Snippet Patterns:

┌─────────────────────────────────────────────────────────────────────────┐
│                     FEATURED SNIPPET FORMATS                             │
├─────────────────────────────────────────────────────────────────────────┤
│                                                                          │
│  QUERY TYPE             WINNING FORMAT         YOUR CONTENT              │
│  ───────────            ──────────────         ────────────              │
│                                                                          │
│  "What is X"            Paragraph              40-60 word definition     │
│                                                after H2, bold keyword    │
│                                                                          │
│  "How to X"             Numbered list          <Steps> component or      │
│                                                1. 2. 3. markdown         │
│                                                                          │
│  "X vs Y"               Table                  | Feature | X | Y |       │
│                                                comparison table          │
│                                                                          │
│  "Types of X"           Bullet list            - **Type 1** — desc       │
│                                                - **Type 2** — desc       │
│                                                                          │
│  "[X] examples"         Code block             ```javascript             │
│                         + explanation          // example code           │
│                                                                          │
└─────────────────────────────────────────────────────────────────────────┘

Definition Paragraph Example (40-60 words):

## What is a Closure in JavaScript?

A **closure** is a function that retains access to variables from its outer 
(enclosing) scope, even after that outer function has finished executing. 
Closures are created every time a function is created in JavaScript, allowing 
inner functions to "remember" and access their lexical environment.

(This is 52 words - perfect for a featured snippet)

Internal Linking Checklist (4 points)

| Check | Points | How to Verify

---|---|---|---
1 | 3-5 related concepts linked in body | 1 | Count /concepts/ links in prose
2 | Descriptive anchor text | 1 | No "click here", "here", "this"
3 | Prerequisites in Warning box | 1 | <Warning> with links at start
4 | Related Concepts section has 4 cards | 1 | <CardGroup> at end with 4 Cards

Good Anchor Text:

Link Placement Strategy:

<!-- In Prerequisites (Warning box) -->
<Warning>
**Prerequisite:** This guide assumes you understand [Promises](/concepts/promises) 
and the [Event Loop](/concepts/event-loop). Read those first if needed.
</Warning>

<!-- In Body Content (natural context) -->
When the callback finishes, it's added to the task queue — managed by 
the [event loop](/concepts/event-loop).

<!-- In Related Concepts Section -->
<CardGroup cols={2}>
  <Card title="Promises" icon="handshake" href="/concepts/promises">
    async/await is built on top of Promises
  </Card>
</CardGroup>

Technical SEO Checklist (3 points)

| Check | Points | How to Verify

---|---|---|---
1 | Single H1 per page | 1 | Only one # heading (the title)
2 | URL slug contains keyword | 1 | /concepts/closures not /concepts/topic-1
3 | No orphan pages | 1 | Page is linked from at least one other page

H1 Rule:

Every page should have exactly ONE H1 (your main title). This is critical for SEO:

• The H1 tells Google what the page is about

• Multiple H1s confuse search engines about page hierarchy

• All other headings should be H2 (##) and below

• The H1 should contain your primary keyword

  Closures in JavaScript ← This is your H1 (only one!)

  What is a Closure? ← H2 for sections

  Lexical Scope ← H3 for subsections

  How Closures Work ← Another H2

URL/Slug Best Practices:

Rules for slugs:

• Include primary keyword — The concept name should be in the URL
• Use hyphens, not underscores — event-loop not event_loop
• Keep slugs short and readable — Under 50 characters
• No UUIDs, database IDs, or random strings
• Lowercase only — /concepts/Event-Loop should be /concepts/event-loop

Orphan Page Detection:

An orphan page has no internal links pointing to it from other pages. This hurts SEO because:

• Google may not discover or crawl it frequently
• It signals the page isn't important to your site structure
• Users can't navigate to it naturally
• Link equity doesn't flow to the page

How to check for orphan pages:

1. Search the codebase for links to this concept: grep -r "/concepts/[slug]" docs/
2. Verify it appears in at least one other concept's "Related Concepts" section
3. Check that pages listing it as a prerequisite link back appropriately
4. Ensure it's included in the navigation (docs.json)

Fixing orphan pages:

• Add the concept to related pages' "Related Concepts" CardGroup
• Link to it naturally in body content of related concepts
• Ensure bidirectional linking (if A links to B, B should link back to A where relevant)

Scoring System

Total Points Available: 30

Score Interpretation

Common SEO Issues and Fixes

Title Tag Issues

Meta Description Issues

Content Structure Issues

Featured Snippet Issues

Internal Linking Issues

Technical SEO Issues

SEO Audit Report Template

Use this template to document your findings.

# SEO Audit Report: [Concept Name]

**File:** `/docs/concepts/[slug].mdx`
**Date:** YYYY-MM-DD
**Auditor:** [Name/Claude]
**Overall Score:** XX/30 (XX%)
**Status:** ✅ Excellent | ⚠️ Needs Work | ❌ Poor

---

## Score Summary

| Category | Score | Status |
|----------|-------|--------|
| Title Tag | X/4 | ✅/⚠️/❌ |
| Meta Description | X/4 | ✅/⚠️/❌ |
| Keyword Placement | X/5 | ✅/⚠️/❌ |
| Content Structure | X/6 | ✅/⚠️/❌ |
| Featured Snippets | X/4 | ✅/⚠️/❌ |
| Internal Linking | X/4 | ✅/⚠️/❌ |
| Technical SEO | X/3 | ✅/⚠️/❌ |
| **Total** | **X/30** | **STATUS** |

---

## Target Keywords

**Primary Keyword:** [e.g., "JavaScript closures"]
**Secondary Keywords:**
- [keyword 1]
- [keyword 2]
- [keyword 3]

**Search Intent:** Informational / How-to / Comparison

---

## Title Tag Analysis

**Current Title:** "[current title from frontmatter]"
**Character Count:** XX characters
**Score:** X/4

| Check | Status | Notes |
|-------|--------|-------|
| Length 50-60 chars | ✅/❌ | XX characters |
| Primary keyword in first half | ✅/❌ | [notes] |
| Ends with "in JavaScript" | ✅/❌ | [notes] |
| Contains compelling hook | ✅/❌ | [notes] |

**Issues Found:** [if any]

**Recommended Title:** "[suggested title]" (XX chars)

---

## Meta Description Analysis

**Current Description:** "[current description from frontmatter]"
**Character Count:** XX characters
**Score:** X/4

| Check | Status | Notes |
|-------|--------|-------|
| Length 150-160 chars | ✅/❌ | XX characters |
| Starts with action word | ✅/❌ | Starts with "[word]" |
| Contains primary keyword | ✅/❌ | [notes] |
| Promises specific value | ✅/❌ | [notes] |

**Issues Found:** [if any]

**Recommended Description:** "[suggested description]" (XX chars)

---

## Keyword Placement Analysis

**Score:** X/5

| Location | Present | Notes |
|----------|---------|-------|
| Title | ✅/❌ | [notes] |
| Meta description | ✅/❌ | [notes] |
| First 100 words | ✅/❌ | Found at word XX |
| H2 heading | ✅/❌ | Found in: "[H2 text]" |
| Natural reading | ✅/❌ | [no stuffing / stuffing detected] |

**Missing Keyword Placements:**
- [ ] [Location where keyword should be added]

---

## Content Structure Analysis

**Word Count:** X,XXX words
**Score:** X/6

| Check | Status | Notes |
|-------|--------|-------|
| Question hook opening | ✅/❌ | [notes] |
| Code in first 200 words | ✅/❌ | Code appears at word XX |
| "What you'll learn" box | ✅/❌ | [present/missing] |
| Short paragraphs | ✅/❌ | [notes on paragraph length] |
| 1,500+ words | ✅/❌ | X,XXX words |
| Bolded key terms | ✅/❌ | [notes] |

**Structure Issues:**
- [ ] [Issue and recommendation]

---

## Featured Snippet Analysis

**Score:** X/4

| Check | Status | Notes |
|-------|--------|-------|
| 40-60 word definition | ✅/❌ | Currently XX words |
| Question-format H2 | ✅/❌ | Found: "[H2]" / Not found |
| Numbered steps | ✅/❌ | [notes] |
| Comparison tables | ✅/❌/N/A | [notes] |

**Snippet Opportunities:**

1. **"What is [concept]" snippet:**
   - Current definition: XX words
   - Action: [Expand to/Trim to] 40-60 words

2. **"How to [action]" snippet:**
   - Action: [Add Steps component / Already present]

---

## Internal Linking Analysis

**Score:** X/4

| Check | Status | Notes |
|-------|--------|-------|
| 3-5 internal links in body | ✅/❌ | Found X links |
| Descriptive anchor text | ✅/❌ | [notes] |
| Prerequisites in Warning | ✅/❌ | [present/missing] |
| Related Concepts section | ✅/❌ | X cards present |

**Current Internal Links:**
1. [Anchor text] → `/concepts/[slug]`
2. [Anchor text] → `/concepts/[slug]`

**Recommended Links to Add:**
- Link to [concept] in [section/context]
- Link to [concept] in [section/context]

**Bad Anchor Text Found:**
- Line XX: "click here" → change to "[descriptive text]"

---

## Technical SEO Analysis

**Score:** X/3

| Check | Status | Notes |
|-------|--------|-------|
| Single H1 per page | ✅/❌ | [Found X H1 tags] |
| URL slug contains keyword | ✅/❌ | Current: `/concepts/[slug]` |
| Not an orphan page | ✅/❌ | Linked from X other pages |

**H1 Tags Found:**
- Line XX: `# [H1 text]` ← Should be the only one
- [List any additional H1s that need to be changed to H2]

**Slug Analysis:**
- Current slug: `[slug].mdx`
- Contains keyword: ✅/❌
- Format correct: ✅/❌ (lowercase, hyphens, no special chars)

**Incoming Links Found:**
1. `/concepts/[other-concept]` → Links to this page in [section]
2. `/concepts/[other-concept]` → Links in Related Concepts

**If orphan page, add links from:**
- [Suggested concept page] in [section]
- [Suggested concept page] in Related Concepts

---

## Priority Fixes

### High Priority (Do First)

1. **[Issue]**
   - Current: [what it is now]
   - Recommended: [what it should be]
   - Impact: [why this matters]

2. **[Issue]**
   - Current: [what it is now]
   - Recommended: [what it should be]
   - Impact: [why this matters]

### Medium Priority

1. **[Issue]**
   - Recommendation: [fix]

### Low Priority (Nice to Have)

1. **[Issue]**
   - Recommendation: [fix]

---

## Competitive Analysis (Optional)

**Top-Ranking Pages for "[primary keyword]":**

1. **[Competitor 1 - URL]**
   - What they do well: [observation]
   - Word count: ~X,XXX

2. **[Competitor 2 - URL]**
   - What they do well: [observation]
   - Word count: ~X,XXX

**Our Advantages:**
- [What we do better]

**Gaps to Fill:**
- [What we're missing that competitors have]

---

## Implementation Checklist

After making fixes, verify:

- [ ] Title is 50-60 characters with keyword and hook
- [ ] Description is 150-160 characters with action word and value
- [ ] Primary keyword in title, description, first 100 words, and H2
- [ ] Opens with question hook
- [ ] Code example in first 200 words
- [ ] "What you'll learn" Info box present
- [ ] Paragraphs are 2-4 sentences
- [ ] 1,500+ words total
- [ ] Key terms bolded on first mention
- [ ] 40-60 word definition for featured snippet
- [ ] At least one question-format H2
- [ ] 3-5 internal links with descriptive anchor text
- [ ] Prerequisites in Warning box (if applicable)
- [ ] Related Concepts section has 4 cards
- [ ] Single H1 per page (title only)
- [ ] URL slug contains primary keyword
- [ ] Page linked from at least one other concept page
- [ ] All fixes implemented and verified

---

## Final Recommendation

**Ready to Publish:** ✅ Yes / ❌ No - [reason]

**Next Review Date:** [When to re-audit, e.g., "3 months" or "after major update"]

Quick Reference

Character Counts

Keyword Density

• Don't exceed 3-4 mentions of exact phrase per 1,000 words
• Use variations naturally (e.g., "closures", "closure", "JavaScript closures")

Content Length

4,000 | Consider splitting

Summary

When auditing a concept page for SEO:

1. Identify target keywords using the keyword cluster for that concept
2. Check title tag — 50-60 chars, keyword first, hook, ends with "JavaScript"
3. Check meta description — 150-160 chars, action word, keyword, specific value
4. Verify keyword placement — Title, description, first 100 words, H2
5. Audit content structure — Question hook, early code, Info box, short paragraphs
6. Optimize for featured snippets — 40-60 word definitions, numbered steps, tables
7. Check internal linking — 3-5 links, good anchors, Related Concepts section
8. Generate report — Document score, issues, and prioritized fixes

Remember: SEO isn't about gaming search engines — it's about making content easy to find for developers who need it. Every optimization should also improve the reader experience.

Weekly Installs

491

Repository

leonardomso/33-…concepts

GitHub Stars

66.3K

First Seen

Jan 20, 2026

Security Audits

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Installed on

opencode337

gemini-cli335

github-copilot313

codex309

claude-code294

cursor287