If you want to use articles as a SEO tool for link building then it should have targeted keywords in it. You could put your links with this articles. It could be on the body of article or on the author box.

As you know keywords are the phrases or words used by people to find what they are searching on the web through search engines like Google, Yahoo!, MSN, Altavista and many others.

The first thing you have to keep in mind is the Keyword Density, that is the amount of times a keyword is used on 100 words. This percentage need to be contained in 2% to 3% in a long article (350 to 400 words).

In every case, more your article is long more that percentage can grow. Instead, if you put too many equal keywords you are kicked by search engines and also by the internal research of any article directory (if your Article will be accepted). So you should consider to count your keyword percentage.

The second thing is about Positioning the articles: What you have to do is you have to find only the most dedicated keywords to let your articles be viewed only by the correct users. The best way is to find only four to five keywords, and your need is to research only the ones related to the topic of the title. This will boost your positioning in a very good way. You have to avoid absolutely too general keywords and double meaning terms.