I am going to agree with what has been said here, as well as add a few tidbits.

Supposedly Google can only read your keywords if they are the first ones in the title. So if you wanted more of a complete sentence, you would need to reword it. For example: Say your keywords were "parenting tips for raising autistic children" you would need to put that up first then do a dash and add something like "5 Key Elements for Helping Your Child Interact with Others"

It used to be a rule of thumb to put your keywords in every 100 words for the proper density. Normally placing keywords in the title, first paragraph, middle paragraph and end paragraph are about right for a 400-500 word article.

Long tail keywords like the example I used above are becoming the idea of choice these days with so many people writing with keywords, the more you can drill down to get close to the exact wording someone might type in to search is good.

At least these are the practices that I use when doing my article marketing.

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Melanie Bremner
Ecommerce Setup and Writing Specialist