Boosting your blog in the search engines. A good tactic?

I’ve been shown that you need to find a keyword with 35,000 or less in competition to have success. Then I’ve been told to post articles to ezine articles with keyword juice and the rankings from hub pages and squidoo help your blog rank on the top of google for free traffic. Have any of you tried this and how has it worked for you? Thanks.
Chad

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