Extension development 

Learn about extensions in TYPO3, the important concepts behind them and the difference between local and system extensions. Learn about Extbase - the MVC basis for extension development.

Learn about reserved file and directory names in extensions and about file naming conventions.

This chapter should also help you find your way around automatically generated or example extensions and sitepackages.

A site package is a custom TYPO3 extension containing files that together provide a site "theme".

Learn about tools to create a new extension or add functionality to an existing extension.

Kickstart your own extension or sitepackage. Explains how to publish an extension. Contains howtos for creating a frontend plugin, a backend module and extending existing TCA.

Extbase is a framework for creating TYPO3 frontend plugins and TYPO3 backend modules.

Explains how to choose an extension key, naming conventions and how to best use configuration files (ext_localconf.php and ext_tables.php)

Contains tutorials for learning about extension development in TYPO3.