Joomla! is a powerful platform, but the default installation represents only a fraction of the power of Joomla. Many Joomla! extensions exist thanks to a design that makes it easy to create new Joomla components and then add them to an existing installation.

This set of tutorials will cover some of the most useful Joomla! extensions.

For a categorized, comprehensive directory  of extensions with reviews and ratings, see http://extensions.joomla.org/