Options (Parameters) Options (also known as parameters) are settings used to customise modules, components, plug-ins and templates. The core extensions in Joomla offer many options that the site administrator can set to change the behavior of the site without requiring any programming knowledge.
Object Oriented Programming (OOP) Programming technique based on using classes, objects, and methods - an approach to designing modular reusable software systems. Joomla is based on OOP. Solid understanding on OOP is a key plus when working with Joomla programs.
User groups Joomla uses groups as a method of assigning permissions. Default groups: Public, Guest, Manager, Administrator, Registered, Author, Editor, Publisher, Publisher, Super Users. However, you can create unlimited user-defined Groups.