seo-optimization
SEO best practices including meta tags, structured data (Schema.org), semantic HTML, performance optimization, and multilingual SEO with hreflang
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- Repository
- Hack23/homepage
- Last source activity
- January 31, 2026 at 15:45
- Detected SKILL.md language
- English
- Stars
- 13
- Forks
- 5
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- seo-optimization
- description
- SEO best practices including meta tags, structured data (Schema.org), semantic HTML, performance optimization, and multilingual SEO with hreflang
- license
- Apache-2.0
# SEO Optimization Skill
## Purpose
Ensures websites are optimized for search engines following modern SEO best practices, with focus on technical SEO, structured data, and international/multilingual support.
## Rules
### Meta Tags (MUST HAVE)
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Title: 50-60 characters -->
<title>Cybersecurity Consulting Services | Hack23 AB</title>
<!-- Meta Description: 150-160 characters -->
<meta name="description" content="Expert cybersecurity consulting with transparent security practices. ISO 27001, GDPR, and NIS2 compliance support for Swedish organizations.">
<!-- Canonical URL -->
<link rel="canonical" href="https://www.hack23.com/services.html">
<!-- Open Graph (Social Media) -->
<meta property="og:title" content="Cybersecurity Consulting Services">
<meta property="og:description" content="Expert security consulting with transparency">
<meta property="og:image" content="https://www.hack23.com/images/og-image.jpg">
<meta property="og:url" content="https://www.hack23.com/services.html">
<meta property="og:type" content="website">
<!-- Twitter Card -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="Cybersecurity Consulting Services">
<meta name="twitter:description" content="Expert security consulting">
<meta name="twitter:image" content="https://www.hack23.com/images/twitter-card.jpg">
</head>
```
### Structured Data (Schema.org)
**MUST USE for:**
- Organization
- WebSite
- BreadcrumbList
- Article (blog posts)
- FAQPage
- Service
**Example - Organization:**
```html
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "Organization",
"name": "Hack23 AB",
"url": "https://www.hack23.com",
"logo": "https://www.hack23.com/images/logo.png",
"description": "Cybersecurity consulting with transparent security practices",
"address": {
"@type": "PostalAddress",
"addressCountry": "SE"
},
"sameAs": [
"https://github.com/Hack23",
"https://www.linkedin.com/company/hack23"
]
}
</script>
```
### Multilingual SEO (hreflang)
**MUST IMPLEMENT for translated pages:**
```html
<link rel="alternate" hreflang="en" href="https://www.hack23.com/services.html">
<link rel="alternate" hreflang="sv" href="https://www.hack23.com/services_sv.html">
<link rel="alternate" hreflang="de" href="https://www.hack23.com/services_de.html">
<link rel="alternate" hreflang="x-default" href="https://www.hack23.com/services.html">
```
### Semantic HTML for SEO
**MUST:**
- Use `<h1>` once per page
- Maintain proper heading hierarchy (h1→h2→h3)
- Use semantic elements (`<article>`, `<nav>`, `<header>`, `<footer>`)
- Include `alt` text on all images
- Use descriptive anchor text
### Performance Optimization
**MUST:**
- Achieve Lighthouse Performance score ≥ 90
- First Contentful Paint < 1.5s
- Largest Contentful Paint < 2.5s
- Time to Interactive < 3.5s
- Use WebP images with fallbacks
- Minify HTML/CSS/JavaScript
- Enable gzip/Brotli compression
- Implement lazy loading for images
### Sitemap & Robots.txt
**sitemap.xml:**
```xml
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
xmlns:xhtml="http://www.w3.org/1999/xhtml">
<url>
<loc>https://www.hack23.com/services.html</loc>
<lastmod>2025-01-24</lastmod>
<changefreq>monthly</changefreq>
<priority>0.8</priority>
<xhtml:link rel="alternate" hreflang="sv" href="https://www.hack23.com/services_sv.html"/>
<xhtml:link rel="alternate" hreflang="de" href="https://www.hack23.com/services_de.html"/>
</url>
</urlset>
```
**robots.txt:**
```
User-agent: *
Allow: /
Sitemap: https://www.hack23.com/sitemap.xml
```
### Security Headers (SEO Impact)
**MUST INCLUDE:**
```
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
Referrer-Policy: strict-origin-when-cross-origin
```
## SEO Checklist
- [ ] Unique `<title>` per page (50-60 chars)
- [ ] Unique meta description per page (150-160 chars)
- [ ] Canonical URL specified
- [ ] Structured data (Schema.org) implemented
- [ ] hreflang tags for translations
- [ ] Sitemap.xml generated and submitted
- [ ] robots.txt configured
- [ ] Mobile-friendly (responsive design)
- [ ] HTTPS enforced
- [ ] Page load time < 3 seconds
- [ ] Images optimized (WebP)
- [ ] Alt text on all images
- [ ] Internal linking structure
- [ ] Breadcrumb navigation
- [ ] 404 page exists
- [ ] No broken links
## Related Documentation
- [html-css-best-practices SKILL.md](../html-css-best-practices/SKILL.md)
- [accessibility-wcag SKILL.md](../accessibility-wcag/SKILL.md)
## Tools
- **Google Search Console**: Monitor search performance
- **Schema.org Validator**: https://validator.schema.org/
- **Rich Results Test**: https://search.google.com/test/rich-results
- **Lighthouse**: Performance and SEO audits
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