The question you ask is somewhat tricky. If you meant, how do you rank for one specific keyword which will cause your webpage or offer to be seen on the first page of google then their are some techniques I have used. Google algorithm have gotten sophisticated over the period of time to detect spammy website and website who simply stuff the pages with the word they want to be ranked on the first page. While this might at work some who can trick the algorithm, their or others who suffers for it.
I personally only make sure to have the title of my webpage mentioning the keywords of choice and mention it also in the body of my website a few times but most importantly I try to enter a few images and enter the keywords in the image tags and I notice several of my pages end up landing on the first page of google, yahoo and bing several times. This technique even works with the press release posted from IBOtoolbox. If you view several of my pressers there, you will see that several of them are have little to know keyword stuffed in the usual place where others have done but instead I choose to focus the keywords in my image tags and I really do not see my pages on google for the keywords I choose to want to be ranked for.