I am trying to make a page of posts, and, if I understand the idea correctly, this would allow me to list all the posts under a specific category or tag, or combination of categories or tags on a single page. Is this correct?
I have found this: http://codex.wordpress.org/Page_Templates#A_Page_of_Posts however, I just want to be clear about what it means when it says: "If you are using a different theme, you need to replicate the HTML structure of your own theme within this template." The template is specific to Twenty Twelve.
--Thanks in advance!