[CMS] How do I display 'x' articles from each category in a section?

[Yellow Slider]

Hi,

I want to display in a section layout 'x' amount of articles from each category under the section.

for example -

Support (section)
cats' -

Windows
Linux
Hardware
Gameswhen entering section Support the display will be
5 latest articles from the section, never mind from which category.

and under it the display will be separated to articles from each category -
4 latest articles of Windows, Then Linux and so on.

I don't really know where should I begin and how should I do that.

Thanks.