what are the buttons u have to press on the key board to minimize a window?

Answer 1

winlogokey+m

Answer 2

I assume you are using Windows .
Pressing Window key + M is the direct answer to you question but it does not been used efficiently. However, I use Window+D instead because it works almost the same way as minimizing the windows but you can do it with one hand.( Definitely, your right hand does not have to leave the mouse to press M or you don't have to spread the left fingers to press M either.)
In windows you can press Window key + D to see the desktop.
that's not the minimize as you want but I always use it in order to see what's going on and then click the task to open up the window that I want to see.
If you would like to see the complete list of hot key that most people use, just check out this link :
http://www.hongkiat.com/blog/2006/12/18/100-keyboard-shortcuts-windows/

Answer 3

Alternatively, press Alt+Space+n

Answer 4

You don't say which operating environment you're using, so I'll give you answers for three popular ones:

Microsoft Windows: Windows Meta Key + M

KDE: Check the Manual - http://docs.kde.org/stable/en/kdebase/faq/windowmanager.html#id2554575
You can define your own keys if you like!

Mac OS X: A list of shortcut keys can be found here: http://docs.info.apple.com/article.html?artnum=75459

Answer 5

press the start button on the keyboard(having windows sign)