If you want to encourage your readers to subscribe to some of the updates of your site, it may be interesting to set up RSS feeds by category.
The feed url to track updates on a category is obtained very simply by getting the URL of your category and add this /feed after the link they are Permalinks.
If yu mention the simple structure use :
http://www.yoursite.com/?feed=rss2&cat=[The category number]
Use the link without the