Actually keywords impact search engine's ranking on the Internet. We will talk about ranking a little later in this article. For now let's clear our concepts of keyword-related terms. Keyword density is the percentage of certain words, referred to as keywords, within a webpage with respect to the total number of index-able words on that webpage. Keyword frequency, as you must have guessed, means the number of times a keyword appears on a webpage. Now, what is a search engine ranking? If you go to Google, type something in the search field and press enter, you are directed to a page containing a list of webpages that match your search. In other words, pages that contain the 'keywords' you typed. The very first webpage will have the highest number of keywords, and in most cases you will only require to visit that page to find the information you were looking for. After that, pages will be listed according to their keyword density. This is called search engine ranking. If you have a website with a lot of content on it and with the right proportion of keywords, you can succeed in marketing of your website.

Now, if you are planning to write quality articles for your website, or for someone else who wants search engine optimized writing, here are some tips. First of all, think of a headline. After that, form a list of keywords; words that you think should be used (but will not be used that frequently in reality as you will shortly learn) throughout the article. Take out only two words from that list and decide which one should be the primary keyword and which one should be the secondary keyword. Hint: Primary keyword should be the one the article is about; in other words the 'topic' of the article you already had in mind (but just one word). Now, change your headline (or the sequence of words in the headline), such that the primary keyword appears in the very beginning (or after two or three words). When you write your first paragraph, use that keyword once again, and then forget it. After that, come to the secondary keyword. Use that in the first and second paragraphs only. What about the rest of the article? Please keep in mind that people think of different words to search on when trying to extract information from the Internet. For example, if I had to look for information on wireless networks, I might type 'wireless connection', and then the model of my phone or something like that. But if you were performing the same kind of search, you might write 'cellular phone connections' or you might want to do a little advanced search and type 'prepaid wireless networks' or 'prepaid wireless connections'. See how many variations are there for the same kind of search. This means that you now have to think of 'variations' to the keywords you selected. Variations could be singular/plural versions of the same word, present/past/future tenses of the same word and so on. Form a list of variations and now use these words throughout your article. The percentage of keyword variation usage in the entire article could be up to 8 to 12 percent according to your own judgment.

I know it sounds too much for a starter. Don't feel overwhelmed with all this 'keyword talk', just write in your normal writing style and then edit it for SEO purpose. Best of luck!