Keywords contained within a Web page are the most important element to achieving high search engine rankings. Keywords are by no means the only relevant factor in how search engines rank a Web page. Other factors also count. But the majority of search engine optimization strategies involve a Webpage's keywords in one form or another.
Therefore, it's fair to say that keywords are the most important element to achieving top search engine rankings. After all, if a page had no text at all, there is nothing for a search engine to index!
Perfect Keywords
Web page should be created by concentrating on the following (in order of importance):
1. one keyword or keyword phrase matching the page content
2. and most frequently used by the target audience
3. and has the least number of competing pages in the search engines.
Admittedly this is not easy and is not always possible. Yet, the best possible combination will work wonders.
Keyword frequency
Keyword frequency refers to the number of times a keyword phrase appears within a page. The theory is that the more times a keyword/s appears within a Webpage, the more relevant the page is likely to be for someone searching those keywords. But refrain from unnecessarily repeating the same keywords over and over again.
Keyword density
Keyword density is the ratio (percentage) of keywords contained within the total number of indexable words within a Web page. In general, a keyword density ratio in the range of 2-8% is optimum.
Keyword prominence
Keyword prominence is about improving the prominence of keywords by placing important keywords at the top of a Web page. Basically, the closer your important keywords are to the start of a page, a sentence, title or meta tag, the better.
Keyword proximity
Keyword proximity refers to the closeness between two or more keywords. In general, the closer the keywords are, the better.
Word stemming
Word stemming is a concept used by some search engines to return search results that include keywords that extend beyond what you searched for. In general, always try to use the longer version of a keyword, especially plurals.
Stop words
Stop words are common words and characters ignored by most search engines like a, are, and, for, from the, this, to, as, at, be, is, it, he, his etc.
Ignoring stop words helps to reduce the amount of storage needed to index the billions of pages of data, and enhance the speed and relevancy of the search results. Only full-text search engines, such as AltaVista, index every single word on a Web page.
As such, always try to use keywords instead of stop words as much as possible. Admittedly, it maybe a bit more difficult to read, but I think it is worth the sacrifice, in the cause of trying to achieve higher search engine rankings.
Keywords in domain names, directories and file names
Keywords in domain names can help to improve search engine rankings. It is a good idea to register keyword rich domain names, it's also a good idea to name directories and file names after the keywords you're targeting.
It is generally recommend registering keyword rich domain names for search engine optimization campaigns.t.