On the home screen you can start your most used applications.
By swiping the screen to the left you can open the app drawer where you can search your application by scrolling or by typing its name. Here you also can make a google search in your default browser with the search button.
By Swiping the screen from the home to the right you can see the settings menu where you can:
-Set the allowed number of columns
-Set the allowed number of top apps on the homescreen
-Set the icon and text size
-Set the wallpaper
-Open the help menu