Here I present a list of useful keyboard shortcuts that most users ignores.
Alt–Enter Opens a file's properties window. Just after that use Ctrl–Page Up/Down to select the window's different tabs.
Opens Windows Task Manager directly. Windows key–Break
Displays the System's Properties dialog box. — Jeremy Kaplan
Opens Windows Explorer in Computer, very useful to manage removable drives and check hard drive partitions for free space.
Turns off a Windows PC. The trick is to not hold down the Windows key; just tap it. — Dan Evans