Your Samsung Galaxy S 3 is highly configurable. You can add apps and widgets to any Home screen.
Your Galaxy S 3 has up to seven separate Home screens. That means you can customize each one with various widgets that are available right out of the box as well as those that you can download from the Google Play store.
In addition to adding widgets – you can add apps to the various Home screens to make them more accessible in the future. Make sure you take a look at the tutorial on adding folders, so you can further customize your Home screens.