SEO keyword use in articles is a bit of an arugmentative topic, much like religion or politics. It's a broadly helpful marketing technique, but everyone has a different feeling on how good or bad it is. Here are some of the basics most people can probably agree on about it, though.
   
Firstly, you should know that the people running search engines don't like SEO marketing techniques. And this is really understandable, but doesn't necessarily mean that SEO is wrong or immoral to use. Search engine companies want to keep control over how sites are ranked on their search results for obvious reasons. For similarly obvious reasons, web site owners like to have some control over that process themselves. SEO writing uses keywords to pack the maximum amount of topic relevance into a piece of writing, making it show up higher in search results.
   
What search engines are looking for is content. The more frequently updated and the more creative and unique it is, the more search engines will prefer it. All search engines really do is serve as great big index-producers of content.  So you want to focus on content before all else, and it should be good content. Quality shows in your ranking, so don't try to skimp on it in the name of expediency.
   
Search engines will also focus particularly on the titles and sub-titles of your articles to see what you're writing about.  So you want to be especially aware of the words you're making use of in those areas, and make them as immediately relevant to the actual content as you possibly can. Try to cram as much keyword-based information in there as you can without it becoming a bad or nonsensical header.
   
The most heated part of SEO use is simply that of keyword frequency or density, in other words, how often you should use various keywords in a given quantity of text. You need to strike a balance between what gets you ranking on search engines and what makes your writing look good to human readers.
   
A delicate amount of keyword use will bring people to your site to start with. But, after all, you want them to stick around, too.  So don't go for a spammy, keyword-stuffed feel.
   
So, should you use SEO? Of course. But remember, like spices, you only want a little to add effectiveness to the overall product.
   
SEO marketing is vital for any business just to maintain a reasonable point of visibility.  But it can be pricey and frustrating, if you're not well-versed in it.
   
You should do the research to have a solid grasp on the thematic concept of SEO keywords.  You should also know all the benefits and drawbacks involved with varying levels of SEO use, and figure out the level that is right for you.
   
Using SEO, your rankings will climb up, your visiting hits will go through the roof.  But more important even than SEO is just giving good content that brings people back again and again.  Consider hiring SEO pros if you can't handle all these different duties simultaneously.
   
Small business owners will find the idea of hiring experts in SEO very useful. SEO marketing isn't something you can neglect, it's far too popular and without it you'll be at the back of the pack.
   
So, use it, either personally or through hired contacts.  But don't overuse it!  And don't neglect the meat of your site either.  SEO is the garnish on top for success.