That depends on how your site structure is set up, I am assuming it's a bit like this:

Content
   - mysite.com
     - Home
     - TextPage
     - News
         - News Item 1 
         - News Item 2
         - News Item 3
         - News Item 4
         - News Item 5
         - News Item 6 

If your document type for the News node has the alias "NewsOverview", then the code to get the latest 3 news items (from anywhere in your site) would be something like this:

@{
  var root = Model.AncestorOrSelf(1);
  var newsRoot = root.Children.Where("NodeTypeAlias == \"NewsOverview\"").FirstOrDefault();

  if (newsRoot.Children.Count() > 0)
  {
    foreach (var newsItem in newsRoot.Children.OrderBy("CreateDate desc").Take(3))
    {
      <div class="newsitem">
        <div class="date">@newsItem.CreateDate</div><br />
        <a href="@newsItem.Url">@newsItem.Name</a>
      </div>
    }
  }
 }