Why do you need overview pages anyway?
Typically, Joomla will lead your site visitor to a category's content in three steps. Between Main Menu and the actual content, there's a secondary page to show category contents. You can see how this works in the screenshots in the following sequence:
The following screenshot displays the screen that appears when a visitor clicks on a menu link:
Then, visitors are taken to an overview page with article previews inviting them to click on the Read more link, as shown in the following screenshot:
Visitors can click on Read more to read the full article, as shown in the following screenshot:
As you can see, what's on the home page and the overview pages (and how it's presented) is vitally important to your site. It's the teaser texts, images, and hyperlinks on these pages that offer your visitors a first glimpse of the actual content. Of course, people don't always arrive at your site through the home page. Search engine results might take them directly to...