Which SEO Technique nowadays most effective and give quick results?

The most effective off page seo techniques that help to rank your keywords higher in search engines are:

Guest posting
Article submission
Press release submission
Social bookmarks
Classified ads
Infographics submission
Social media optimization

Both On page and Off page are effective.

off page optimization, on page optimization both is most effective.
classified
article submission
social media sharing
bookmarking
forum participation
blog content
that all activities most effective of off page optimization site.

Most effective SEO Techniques are:
1. Blog Posting
2.Social Book Marking
3.Forum Posting
4.Web2.0 Creation
5.Article Submission
6.SMO
7.Classified Posting
8.Directory Submission
9.Business Directory
10.Infographic Submission
11.Press Release