The Fruit Shop site shows a number of Joomla! features.
The template uses classes in cascading style sheets to change the layout of items, such as creating the horizontal alphabetical list in the Fruit Encyclopedia.
This module can only be seen by people in the customers group or higher.
These are my photos from parks I have visited (I didn't take them, they are all from Wikimedia Commons).
This shows you how to make a simple image gallery using articles in com_content.
In each article put a thumbnail image before a "readmore" and the full size image after it. Set the article to Show Intro Text: Hide.