Depending on the applications you have in use, you’ll have access to a varying amount of actual widgets. To add a widget to your Home screen, hold-tap and select Widgets from the Add to Home screen menu.
For instance, in my list of Widgets, I have Facebook, Last.fm and Twidroyd. If I want quick access on my Home screen to my Last.fm playlist I can choose this. If I want to be able to make quick Twitter updates from my Home screen, I will choose the Twidroyd widget. With the Facebook app widget, I can update and check updates from friends, all from the Home screen without running the full app. This can save resources as you are only running a stripped down portion of the app rather than the full app!
Note that you will need space on your Home screen when adding a new widget – Android will tell you if the chosen widget will not fit, and you may need to rearrange or switch to one of your other Home screens. Alternatively, you might use an app like aHome Lite, a desktop expander for Android.
However, you might prefer to stick to the basic number of screens. To tidy your existing Android widgets and shortcuts, hold down the icon and wait for the bin icon to appear, before dragging the icon into it.