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.
TYPO3 files and user files¶
All files in the TYPO3 web site directory hierarchy are divided into TYPO3 files and user files.
TYPO3 files are files that come with the TYPO3 source package released
by the TYPO3 association. This includes files inside the
directory and the file named
index.php in the root of the TYPO3
All other files are user files. This for example includes extensions,
files in the
fileadmin/ directory or files generated by TYPO3
(like configuration files, thumbnails or temporary CSS files). User
files are not allowed in the folder
These CGLs are valid for all TYPO3 files and for those user files,
which are to be generated or processed by the TYPO3 Core like for