Search Engine Optimization (SEO)

Domain

• use a speaking URL
• differanciate between subdomain and subdirectory

Title

• every page shound have a unique speaking title (60 - 100 characters)

Keywords

• every page shound have unique keywords
• max. 10 keywords

Description

• every page shound have a unique description
• max. 255 characters

Content

• Content matters the most
• Page Title should appear 3% of content length
• add ~ 3 internal links
• use strong tag
• do not provide duplicated content
• article should be at least 300 words

Headings

• Clear structure H1 - H6

Images

• Alt tag (60 - 70 characters)
• Use a CDN or a subdomain to allow parallal http-requests

Links

• add meaningful title
• Only add external links if you got a backlink to your site

Social Media

• Social link rank up your site
• use social snippets Facebook, Twitter

Sitemap

• provide a .xml sitemap

Errors and access

• provide 403 - Acced denied page
• provide 404 - Page not found page
• add a robots.txt file

HTAccess

• enable GZip
• enable caching

Performance

• Performance and loading time matters
• only serve concatenated and minified files
• if possible no redirects

UX

• User friendly site
• clickable links should not be too small

Mobile

• create a mobile-friendly site (shown in search results)

Validation and accessibility

• Write valid markup
• use WAI-Aria tags