If you want to display a list of articles from a single category (or category with subcategories) there is a simple solution using the [Category Blog] Menu Item.
- Create a new Menu Item
- Choose [Category Blog]
- In the [Category Options] choose whether to include subcategories
- Set the [Blog Options] to 0 - 0 -1 -50 (leading article - intro article - columns - # articles in list
That's it, you will now see a simple list of articles.
The heading will be "More Articles...". If you want to change this string to let's say "Articles in this Category" you can do so in the language file. Edit the file: /language/en-GB/en-GB.com_content.ini