Book excerpt: The second edition of this popular book has been updated for TYPO3 CMS 7 LTS and is a must-read for beginners and advanced developers. Extensions are the cornerstone of TYPO3 CMS and an essential part of every TYPO3 installation. The fastest and most efficient method for developing extensions is by utilizing the Extbase framework and Fluid templating engine. This book provides all you need to know to get up and running with Extbase and Fluid in an easy-to-follow format with real-world examples. The book was written to help TYPO3 developers produce clean code in modern standards, backed by contemporary programming principles. Authored by Patrick Lobacher and Michael Schams, who are well-known members of the TYPO3 community, the second edition of this book has been updated and covers all new aspects of TYPO3 CMS 7 LTS. From the basics of object-orientated programming in PHP to the principles of Domain Driven Design and the MVC concept (Model-View-Controller), the authors explain theoretical foundations as well as practical solutions. After working through this book, extension developers have all knowledge on hand to master TYPO3 projects of all sizes and complexities in Extbase and Fluid.