What is main factor for SEO?

Content posting is main factor and on page

If we talk about SEO, 75% of work is On Page while 35% is off Page. The Most Important three factors are:
Factor 1: Use Your Key Phrase in Your Title
Factor 2: Use the Target Key Phrase in the Body Copy
Factor 3: Cross Link Your Pages Using the Target Key Phrases

Good Back links and unique content are the main factors of SEO...

Back links on good sites and good on-page.

On-page seo. content quality must need.

quality content is everything

According to me Content of articles, Blogs are the main factors of SEO.

Today 's world of SEO means Quality Content

Fresh and unique content is the main for the SEO

Unique fresh content and credibility among users.

Good keyword Research , Unique content , update website regularly , get social ...

First thing that came to my mind is content, second you will want to have the keywords you want to rank for in your title , and included as much as possible in your content to.

For anyone trying to learn seo here is where i learn for free , quality information http://moz.com/learn/seo have a great day everyone.

Keyword research. I use longtail keyword phrases with lower competition, provide useful content, and do minimal but natural backlinking along with SocialAdr. All my content is on free platforms like blogger and I get about 80% of it on page 1 within a couple months. I get less traffic but higher clickthru and conversion rates on my affiliate programs.

be creative and keep working on site that are still ranking after all these penguin updates.

You should be work according to penguin 2.1 update.

Amit, mention all factors are important for seo but use just relevant and high quality website.

The content and quality backlinks from relevant high quality websites!

Unique Content Like Unique title, Unique description, Unique keyword

Unique Content is the main factor

With all of the changes that are occurring with Google. The best you can do is write good quality content. Do press releases and find other places to comment on that are relevant to your website. :)