Showing posts from different tags in the same page

Hi,

I’m trying to have a page in my site (not the home page) that will display excerpts of posts from different tags. It’s a page that displays different “topics” and I would like to have each topic displaying all of its relevant posts so far.

To make it easier, here is the page: http://www.thephotographyreview.com/sample-page/camera-reviews

Under each camera brand I want to display the posts related to it, without having to copy/paste every new post I make.

How can I retrieve the content I want using the page/post editor? I know html well enough to get by, but I don’t know php at all.

Thanks in advance!