TYPO3 v8 has reached its end-of-life March 31st, 2020 and is not maintained by the community anymore.
You can order Extended Long Term Support (ELTS) here: TYPO3 ELTS.
File system conventions¶
There are certain conventions about naming files and directories in the TYPO3 core and extensions. Some of them are historical and do not follow other formal rules. They will be described separately. New core classes and extensions are required to follow the formal rules outlined below.