Text (Content) Optimization Every web page needs its content, without content there is nothing for the spider to index - but the content should also be unique, well written and keyword rich. The correct keyword density is particularly important, but thats a constantly variable ratio that depends on overall page length (in words, not pixels!) and the particular keywords that you are targetting. To get a good idea of the optimal keyword density of the terms that you are targetting its advisable to do a search for the keyword string in question, open all 10 of the first page results and run them through the keyword density tool that comes with SEOquake. That tool is particularly interesting because it splits out rather well single and multiple keyword strings and compare the overal percentage between the top results. Once you know have done that you should target the average percentage of the top 3 or 4 pages to +/- 0.25% with keywords distributed naturally between the text (in content) - with at least one iteration of the term right at the very start or as close as possible of the text on page, an iteration in your H1 text and it repeated in the title tag for the page. Once you get used to this stlye of SEO Copywriting then it comes fairly naturally so dont worry!
There is no such thing as optimal keyword density. The info is misleading - if some site ranks well and has a keyword density of say 5% then you cannot make a conclusion that it was the keyword density that make that site rank so well. This is illogical statement. Just like: I can play piano and I'm reading this forum now, therefore I'm reading this forum because I can play piano. Wrong. Well, in fact I can't play piano