Mac OS X useful tips and tricks for users

It is always good to know about different tips and tricks of anything. When it comes to tips or tricks about Mac OS X then it is really exciting. Following are some really useful Mac OS X tips and tricks:

F11 or Command-F3
This will swish all the windows out of the way temporarily so we can see the desktop.
To minimize the current window.
To minimize all windows of the app in focus.
Force quit application popup