I've seen other sites offer separate RSS feeds for each of their categories. So I found out how to do it and thought I would post it here in case others would like to know too.
Be sure you use the SLUG and not the category name. For example: My category is World of Warcraft. I wouldn't put http://gamerofsorts.com/category/worldofwarcraft/feed
. I would use the slug and it would be: http://gamerofsorts.com/category/world-of-warcraft/feed
To find the slug just go to your categories section on your dashboard.
For specific authors:http://example.com/author/authorname/feed/