johnniewalk

It doesn't matter single keyword or more keyword all the density will calculate that in the whole content of the web page, targeted keywords density should be 3 to 5 percent.  

Well in the part of SEO optimization, so many things are there so among those the above information is a part of that it is a useful one.

You have to follow all the off page seo techniques like directories, web2.0, blog, article submissions, document sharing, forum posting and many more..

I searched your link in the search engine but i can't find any useful site in that, can share a proper link so that it helps me to create a quality dofollow backlinks to my website.

After the penguin update your website has been penalized means you to regain it you have to remove some bad or broken urls, try to create more backlinks which relevant to your category websites, getting a backlinks from high domain authority sites are important.. 

you missed out few techniques like business listing, web 2.0, blog post, guest post, document sharing, info graphics..

First of all you have to choose an appropriate topic related to your website. Once the topic have been choose, next step is refer some content relevant to your same topic and make a rewrite it. Try to insert keywords not more than 5 % of keyword density.

In this post i didn't find any relevant useful information or tips..

If your website is not visible in the search engine, then google algorithm won't index your content.

Many of the social bookmarking sites may expired, so what are the links which you created by using social bookmarking sites will be expired. My suggestion is, submit only top 50 social bookmarking sites, those are stable. 

But search engine informs that due to lot of spammers, it won't provide much preference for the article submission.

Well said a useful information, it helps to know about the search engine works in providing a serps result.

But regularly keep on changing in the website will harm your website rankings right.. 

well explained about panda useful information, be aware of it spammers..

Yes i agree with you but the main thing is to submit the content in the press release, a news about your company information should be published in any of the news paper or magazines then only you can able to post the content in the press release. One more thing almost all the press releases have a paid option..

Using both is important but if you thought provide much preference then go for facebook..

A link is coming from some other website to your website will be consider as a back link for your website.

Better you can search it manually by using the search engine.

Really your query sounds like ppc but the topic is related to blog sites.. I am confused.

Email marketing will not come under seo, it is different kind of strategies in the marketing field. By sending a bulk of emails to the targeted audience, it identifies the exact audience who really needs the services.. 

This post is full and full information regarding an on page seo. On page is important factor which plays a major role in ranking your keywords top in the serp's 

The whole task of seo optimization means visible your website in the search engine, so nobody knows your website name or link right. So to make it visible keyword phrase is important, so through keywords only users can identify your website..

I thing there is no tricks in seo, if you trick the search engine and you will be penalized.

No need to ping all the links, ping which ever the links is not crawled and indexed by the search engine. Ping is used to make search engine crawl a particular links.

Seo will help you to reach your targeted customers globally, by visible your website in the search engine through organic way.