how to spam a wp homepage?

i know this probably is a noob question but i am still trying to build up a decent website and i am using WP.

here is my problem: how can i increase the keyword density for my main keyword on the homepage since the content of the homepage is changed everytime i post new articles?

when i decide to promote the blog and getting some backlinks for my keywords..how should i do?

should i spam links for the specific article's page considering the keyword i am working on or should i point all my external backlinks to the homepage???

i am still confused if a static website would be better or not....

can you give me an hand please?

What you could do is have a fixed homepage with the keyword density that you want. The new posts could be available to your readers as title summaries in the sidebar. Have a look in the Reading Settings in your control panel.