Overview of standards and best practices for developers
Ideally, all code that is included in Drupal Core and contributed modules, themes, and distributions will be secure, internationalized, maintainable, and efficient. In order to facilitate this, the Drupal community has developed a set of guidelines and standards for developers to follow. Most of these standards can be found under Best practices on Drupal.org
Standards and best practices that developers should be aware of include:
© 2001–2016 by the original authors
Licensed under the GNU General Public License, version 2 and later.
Drupal is a registered trademark of Dries Buytaert.
https://api.drupal.org/api/drupal/core!core.api.php/group/best_practices/8.1.x