This article focuses on using multiple languages on a Joomla!-based site. It shows you how to add a language, translate language files, translate a site's content on the fly using Google's translation service.

Next to text content, images are one of the most utilized multimedia resources in web pages. This article covers Creating image galleries and slideshows, Template images, Joomla! Image Extensions and Browser support and accessibility for images.

Joomla! has many extensions that can help develop a custom application, especially simple form-based applications. With introduction of Content Construction Kits (CCK) now it is possible to create many types of contents without knowledge of coding PHP. Besides these newly introduced Content Creation Kits, there is another application builder for Joomla! that can be used to build database applications without coding PHP. It is called Fabrik. Fabrik is Joomla! application builder that can be used for building many types of applications. In this article by Suhreed Sarkar, we will learn how to build a event calendar application for Joomla! using Fabrik.

There have been lots of people that have tried to answer this question, and its a hard one. One thing that I think makes it hard is the question isn't "what is the best extension?" That sort of question is really focusing on a particular scenario. The questioner perhaps means something like "what is the best comment extension?"