RSS feeds provide a way for you to subscribe to the content of a website and have new material delivered to you immediately without having to repeatedly check the site for updates. Whenever you see a "subscribe" or "feed" link on this site, you can use it to subscribe to GCC content. Also, some browsers will display an RSS icon in the URL bar when they detect feeds on a page, allowing you to click that icon to subscribe.
You can also follow GCC and receive updates on Twitter and Facebook.