There are too many seo tasks are available i know 19 off page seo tasks which is enough to get ranked in any search engine.

Two way SEO is
- Onpage
- Offpage

You should make good ONPAGE and after you can put backlinks in forums, social, web 2.0

Few effective off-page SEO techniques are-
Social bookmarking.
Forum posting.
QnA.
PPT/PDF creation & submission.
Video creation & submission.
Web 2.0.
Micro blogging.
Infographics creation & submission.
Blog posting.

There are to main techniques
1.ONpage
2.Offpage

Nice comments above

Few off-page SEO techniques are-
Social bookmarking.
Forum posting.
QnA.
PPT/PDF creation & submission.
Video creation & submission.
Web 2.0.
Micro blogging.
Info-graphics creation & submission.
Blog posting.

SEO Techniques

1.Bookmarking Commenting
2.Directory Submission
3.Forum Posting
4.Press Release
5.Video Submission
6.Image Submission
7. PDF Submission
8. Blog Posting
9. Social Media
10. Forum Posting

Two Types of SEO techniques:-
On Page SEO
Off page SEO

SEO Techniques,

1. Directory Submission
2. Bookmarking Submission
3. IMage Optimization
4. Video Submission
5. Blog POsting
6. Blog Commenting
7. Guest Blogging
8. Press Release
9. Social Media
10. Forum Posting

1. Map Technique To Audience & Competitive Experience

2. Align Your Articles & Search engine optimization Teams

3. Make Mobile Search engine optimization Important

4. Find Measurement & Confirming That Actually Works

5. Integrate Search engine optimization Data Across Teams

1. Directory Submission

2. Book-marking Submission

3. IMage Optimisation

4. Video Submission

5. Blog POsting

6. Blog Leaving comments

7. Guest Blogging

8. Pr Release

9. Social Networking

10. Forum Posting

Mobile SEO A Priority

I think both are important

There are two techniques for SEO.
1. Off-page
2. On-page
On-page is done in the beginning of SEO, if it is done properly for each web page then it will be easy to rank on the search engine for the keywords. In that, we require to do the activities like creating meta tags, content optimization, URL optimization, image optimization, checking keyword density percentage etc.
In off-page is known as creating back links but the quality back-links as per Google Algorithm.

1. Forum posting
2. Social Bookmarking

Cool replies above