SEO Techniques are Two type

On page SEO and Off page SEO

Article submission
Blog submission
Classified submission
Question answering
Forum profile creation
PPT sharing
Directory submission
PDF submission
Local business listing


On page Activity

Title
Meta Description
Meta Keywords
URL structure
Sitemap.xml
Robots.txt
Google Analytic
Google Webmaster
Heading tags
Alt text
301 Redirection
404 error page