You have more people using one computer and you don't want them to be able to shut it down using a shutdown button on Windows logon screen, this is how you remove it.
Windows Explorer does not have menu displayed by default like you were used to in previous versions. To activate and keep it permanently visible follow this tutorial.
Windows 8 has very functional calendar to remind you about all events you don't want to miss. In this lesson I will show you an example how to add birthday reminder.