I\'m trying to find useful tutorials about how to create modern websites that loads content without refreshing the page.
I have tried all kinds of words in Google, but I
You'll want use ajax. There are also ways to poll the server for updates as well. You can use a setInterval call to periodically retrieve a URL; but this is only required if you're polling. If you're doing this action based on a user event, you can just use that to trigger the retrieval/update. I'd suggest looking at jQuery, it'll make this kind stuff much easier.