Mother_board
01. Hardware selection
Every slide includes a background, which can be a picture or solid color.
Step 1

To change the background click on the label bar and in the layer window select the style tab.

Step 2

Choose a source from the background top tab then upload an image or pick a background color.

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Mother_board
CPU
Fibre cable
Fibre cable
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Shadow

Module positions are placeholders in a template. They identify positions within the template and tell the Joomla! application where to place output from modules assigned to a particular position. The template designer has complete control over module positions, creating variations between templates and the respective Joomla! default positions assigned to modules in the installation sample data.

For example, the module position Left could be defined to be on the left side of the template to display a site navigation menu. So if a module is assigned the Left position, it will be displayed wherever the designer puts that Left module position - not necessarily the left side of the page.

Reference: http://docs.joomla.org/Glossary