Here is a collection of the key terms regularly used in Moodle. Best to learn them now. It will assist your future learning a use of Moodle. One can't learn the concepts without first understanding the words.
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An acronym for PHP Extension and Application Repository. PEAR is a framework and distribution system for reusable PHP components.
For more information see http://pear.php.net/.
PostgreSQL is a full-featured open-source database with many enterprise features, including:
See http://www.postgresql.org/ for more information.
Postnuke is a free, open source, database driven php website. Many Moodle people use postnuke as a front end page to forums, calendars, guestbook and other non-education specific activities. There are literaly thousands of free themes, and hundreds of open source modules that a postnuke site can use.
However, the administration and permission system UI for postnuke can be daunting for newbies, and often requires some basic knowledge of php coding to implement many tasks.
A great website for educators to start at is the postnuke education forum.
A production site is site that is publicly operating, it has courses and is being used by anyone enrolled.