With the new iOS one of the nicest features of the iPad and iPhone is the ability to bookmark frequently used websites directly to the Home Screen. FaceBook, LinkedIn and the mobile versions of Windows Live, Yahoo and the various Google sites are all useful to have as instant access shortcuts. These are just a few of the many sites you can add to your home screen. Sites without this feature you won't have the option to "Add To Home Screen".
Open Safari, navigate to the web site you're interested in adding, Tap on the Share icon, and in the 2nd row of icons (if available) will be the Add To Home Screen button.