Lots of ways to do this. One is to have your own function like this in your HomePage.php file.
// mysite/code/HomePage.php (or Page.php)
function AllMyArticles() {
return DataObject::get('MyArticleClass');
}
Then you have a control in your template <% control AllMyArticles %> which will loop over all your articles. Another way to do it is if all your articles are in 1 place then you can use the ChildrenOf function in the template
// themes/yourtheme/templates/Layout/HomePage.ss (or whatever template
<% control ChildrenOf(my-article-holder) %>
// now I have children
..