Write content that your potential users would find interesting. Don't just copy PLR articles and paste them thinking that's just what people are looking for, they can find the exact articleson on 200,000+ other websites that're doing just that. (No joke)
Be unique, creative, and try to write unique content that Google wouldn't find anywhere else. Protect your work so nobody else can steal it. If they do steal it, try to get them to take it down. If you have the budget, utilize DMCA in your favor. This will prevent duplicate content. (This is not legal advice)
Don't over saturate your website with keywords, this will result in penalties by search engines.
SEO should be about people, not search engines. Optimize your content for people and they're more likely to be return visitors. Google will give priority to your website if your users are return-visitors and talk about your website on Facebook, Twitter, other social sites, etc,. They're creating "Link Juice" for you, and that's the best way to gain reputation.
First and foremost write your own content. If its copied from somewhere else, you are doomed.
Secondly there are certain myths as keyword density and stuff but they are not very important. Rather giving them more importance could be harmful.
Just write your content for human visitors that might interest them and that would be best for you.
Seo friendly content writing is not magic it's just a keep in mind like
- Not to be keyword stuffing
- Include inner sub-headings and they should contain your keyword phrase.
- Not to be copy-paste content to another site.
because this is the measure issue of duplicity & web spamming.
The thing is that when you add links to your article, it is important to make it part of your copy instead of just saying 'check it here'. Adding back links from credible websites that you used as a source is important as it builds trust and credibility with your readers about the information you are sharing.
You can research is vital to creating a piece that people will truly find valuable and worthy of sending along to their friends and colleagues. By taking time to do your research, you may possibly uncover an original reference or resource that will benefit your audience.
If you really can't stand doing research, then find a service or person who enjoys doing it and have them assist you.
Google will tell you, do not write content for the search engine, write it for quality.
Google's ever-changing algorithm is designed so that quality content will be apparent and generally already have the right combination of keywords, etc to help it in its rankings. This is what the big G wants to have at the top.
Things like intentionally increasing the keyword density, etc are obsolete and can actually get you penalized. Proper content writing will take care of this naturally so there is no need to spend time analyzing to get a certain percentage.
Just focus on writing the best content you can and that will cause you to leap far above most other people out there, even ones who are trying antiquated SEO techniques. It is mostly just common sense. Tell the customer what you need to in the best way possible and you will be rewarded with a good ranking.