Example: I own a sports website that consist of an articles directory. I allow authors to post their article related to sports. My directory comes with its very own RSS Feed.
I have a category called baseball cards. This is a category where people can post articles about the hobby. So the keyword phrase baseball cards maybe used on all those articles; including the title tag and description. Is this okay?
Preferably you should have a different <title>Your Page Title Here</title> and <meta name=”description” content=” Your description here”> for each page.
If the article submissions are infrequent you can simply hand code a suitable title and description for each page.
If the publishing of the articles is automated simply have the authors enter a title and a description when they upload and pick up those fields for dynamic placement in the header.