Don't sweat the details over keyword density. Since the first Panda update to Google's search algorithm earlier this year the actual content on your site is way more important. So just focus on writing detailed, well-researched and well-written articles.

This article I've linked to below explains how SEO has changed, and there's a link at the bottom to an article on SEOMoz, explaining in further detail.

SEO Has Changed | WealthyDragon

And yes - ultimately off-site SEO has more impact on your search results placing.

Cheers,

Martin.

you can set a page as main page
set 3 keywords for every of your post
before you write article, try your best to set keywords first

Set your priority to content uniqueness followed by keywords on your post.

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hi,
i agree with @dailyseo that its best to set 3 keywords before you post a article.

Maximum 2 keywords must be used for a post

If your homepage displays all your posts (as you mentioned 4 posts), make sure to use raed more tag.
This will just display the snippets of posts and will help you to avoid duplicate content issue.

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Hi guys according to me 2 to 3 keyword is enough for a post.

Yes, I'm always target 3 keywords, but what about anchor text? Is it the same? Or just one?

Yeah, be natural about it as Google is cracking down more and mroe. It's not worth getting deindexed for.

For blog posting, I think 1 keyword is good for single posting

According to me you can target 2-3 keywords per post, but it entirely depends on content of your blog post.