Keywords and latent semantic indexing
It’s undeniable fact now that choosing keywords for your internet project can be regarded as the most important step in your pursue to achieve a well-received website. So once you have your keyword, what are you doing to do with them? I guess you must be thinking I’m nuts for asking this question. Well, of course, we need to write relevant unique content with the keywords that we have just identified.
That will mean keyword density will come into the question. Keyword density refers to the percentage or the number of times in which your keyword has appeared in your fixed length post. Its very easy to derive. Just count the total number of words and count the number of times keyword is repeated and you can work out the keyword density. What I recommend is about 3% to 5%. That should be fine.
Well, what i read is that Google is no longer focusing its search algorithm on keyword density right now and we are advised not to focus much on the keyword. Just focus to write a decent article that human beings can read logically. I’m not sure that is true. It could be possible. Google’s search engine is already smarter than before and maybe it does not look at keyword density now? No matter how, I’ll still ask people to play safe just to be sure. Just splatter a couple of keywords in your article would be nice, at least.
I suppose you have heard of LSI, Latent Semantic Index. It means the search engine will look at the RELATED words associated with the main keyword. For example let say your post is about “safe driving tips”, it would be relevant to have some secondary keywords associated to “safe driving tips”, like speed, distance, acceleration, weather or blind spot. So from now on, write articles base on this concept.
Remember, relevance is everything for website content. If the topic is not relevant to your website, it is not worth displaying. Search engines may skip your website if they cannot find a solid theme to help categorize your website. If you sell cleaning products, your text should talk about stains, fabric treatments, cleaning processes, cleaning tips and cleaning products. If a search engine spider visits your website that sells cleaning products and finds information on how to grow beautiful tulips or how to master php programming in 21 days, it is not likely to list your website for keywords pertaining to cleaning products. These may be interesting topics, but they are not relevant to your website.
If there is anything you feel is incorrect, feel free to drop me a note. 
It’s how we learn.