+
+
+
+```
+
+**Security headers for SEO trust signals:**
+```
+Strict-Transport-Security: max-age=31536000; includeSubDomains
+X-Content-Type-Options: nosniff
+X-Frame-Options: DENY
+```
+
+---
+
+## On-page SEO
+
+### Title tags
+
+```html
+
+
+
+
+
+```
+
+**Image guidelines:**
+- Descriptive filenames with keywords
+- Alt text describes the image content
+- Compressed and properly sized
+- WebP/AVIF with fallbacks
+- Lazy load below-fold images
+
+### Internal linking
+
+```html
+
+Click here
+Read more
+
+
+Browse our blue widget collection
+Learn how to maintain your widgets
+```
+
+**Linking guidelines:**
+- Descriptive anchor text with keywords
+- Link to relevant internal pages
+- Reasonable number of links per page
+- Fix broken links promptly
+- Use breadcrumbs for hierarchy
+
+---
+
+## Structured data (JSON-LD)
+
+### Organization
+
+```html
+
+```
+
+### Article
+
+```html
+
+```
+
+### Product
+
+```html
+
+```
+
+### FAQ
+
+```html
+
+```
+
+### Breadcrumbs
+
+```html
+
+```
+
+### Validation
+
+Test structured data at:
+- [Google Rich Results Test](https://search.google.com/test/rich-results)
+- [Schema.org Validator](https://validator.schema.org/)
+
+---
+
+## Mobile SEO
+
+### Responsive design
+
+```html
+
+
+
+
+
+```
+
+### Tap targets
+
+```css
+/* ❌ Too small for mobile */
+.small-link {
+ padding: 4px;
+ font-size: 12px;
+}
+
+/* ✅ Adequate tap target */
+.mobile-friendly-link {
+ padding: 12px;
+ font-size: 16px;
+ min-height: 48px;
+ min-width: 48px;
+}
+```
+
+### Font sizes
+
+```css
+/* ❌ Too small on mobile */
+body {
+ font-size: 10px;
+}
+
+/* ✅ Readable without zooming */
+body {
+ font-size: 16px;
+ line-height: 1.5;
+}
+```
+
+---
+
+## International SEO
+
+### Hreflang tags
+
+```html
+
+
+
+
+
+```
+
+### Language declaration
+
+```html
+
+
+
+```
+
+---
+
+## SEO audit checklist
+
+### Critical
+- [ ] HTTPS enabled
+- [ ] robots.txt allows crawling
+- [ ] No `noindex` on important pages
+- [ ] Title tags present and unique
+- [ ] Single `