The general rule of thumb is that you optimize each page for ideally no more
than two different keyword phrases.
Each page should include your Primary Keyword Phrase. Your home page should also contain your best Secondary Keyword Phrase. Each product, service, or content page should also contain the best specific variation to your Primary Keyword Phrase. Because your home page is generally the one that gets the highest ranking, and is linked to most from other sites, you need to place special emphasis on the use of your Primary Keyword Phrase there. Your home page will then link to other pages on your site that contain (and are optimized for) your other, more specific, keyword phrases.
Hope this could help.
