Help with keyword target Url in WP adsense site

Hello, I am pretty new in IM field and as such I've got many questions. Until now for almost everything I needed to know I was able to find answers searching the forum (that is why I have no posts activity). However, now I'm struggling with one question and despite the extensive search, I couldn't find exact answer for (or maybe I missed it).

I'm setting up a micro niche wp site targeting group of 5 keywords and trying to figure out the optimal SEO setting for the site. I read about pages vs. posts, but still confused and not being able to figure out the following:

Should I set up a different page for each keyword phrase with static text as target URL for that keyword and have all new coming posts categorized in categories with link in each post pointing to the keyword page?

Or perhaps I should forget about pages and target one post for each keyword and try to rank the URL of this specific post instead? Therefore have links to this post from each new coming post.

And the third option (which is most logical for me) is have /category/post title (/%category%/%postname%.html) structure where I can target the category URL. In the last scenario the page content won't be static and will change adding new posts. Than I have to have displaying at least 8 latest posts with enough text to show the given keyword and really don't know how it will work SEOwise.
Or maybe there is whole different way to go.

I know that the above should be known as essential base knowledge and in that regard my askings may sound silly. Nevertheless, I would really appreciate any suggestions and help on this topic from experts, which I see many in here. Thank you in advance!