After restarting your Pi, the Raspbian graphical desktop appears, and you are logged in as pi with the password as raspberry (if you did not change it).
Notice that the desktop is uncluttered. All the current GUI applications are located in the menu and five applications are on the quick launch bar. From the Menu/Shutdown, you can Shutdown, Reboot, or Logout. The following is a list of quick pointers of handy keyboard accelerators that you might find useful:
Ctrl + Alt + Backspace: Use this key combination to log out of the current Xsession user (use Xsession to login).
Ctrl + Alt + F1: Use this key combination to switch to a command session on tty1 (type exit to close)
Ctrl + Alt + F7: Use this key combination to switch back to the graphical desktop
Ctrl + Alt + F2 through F6: Use this key combination to switch to a command session on tty2-tty6