PHP: Learn to Create Extension Files and Extension Classes Using TYPO3

All TYPO3 extensions are classified into several predefined categories. These categories do not actually differentiate the extensions. They are more like hints for users about extension functionality. Often, it is difficult for the developer to decide which category an extension should belong to. The same extension can provide PHP code that fits into many categories. An extension can contain Frontend (FE) Plugins, Backend (BE) modules, static data, and services, all at once. While it is not alwa