I think All Off page activity are the good.
Forum submission
Article submission
Yahoo answering
Blog commenting
Social Bookmarking submission
Directory submission
Images sharing
Video sharing

strong on-page and off page are excellent techniques for seo.

I suggest you like and comment on blogs, forums, pages with relevant and helpful info. You could also use tools like traffic travis 4.0 or backlinkwatch.com to check how well you doing. Hope it helps. :D

Optimize your title tags is the Excellent SEO techniques

Getting high quality natural backlinks are the best techniques with proper on page seo.

You can use both on page optimization as well as off page optimization. On page optimization includes the page title, title tags, meta tags, meta description, url structure, etc. And off page optimization includes social bookmarking, image backlinking, web 2.0, podcast, infografics and many other techniques.

forum posting,blog commenting,social book marking.

Best SEO Techniques are

1.Guest posting
2.Relevant Backlink building
3.Press release submission
4.Web 2.0 Submission
5.Social Bookmarking