TYPO3 v9 has reached its end-of-life September 30th, 2021 and is not maintained by the community anymore. Looking for a stable version? Use the version switch on the top left.
You can order Extended Long Term Support (ELTS) here: TYPO3 ELTS.
Directories and Filenames¶
Use spaces, not TABs.
Indent with 2 spaces.
Use single quotes ('') for strings.
Prefix jQuery object variables with a