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.
Coding: Best practices¶
This section documents some best practices when developing for TYPO3. Most areas are documented in more detail at different places, this part is just an overview of common pitfalls and generic tips.