Magento 2.1.18 is the final 2.1.x release. After June 2019, Magento 2.1.x will no longer receive security patches, quality fixes, or documentation updates.To maintain your site's performance, security, and PCI compliance, upgrade to the latest version of Magento.
Coding Standards
Like many large projects, Magento has coding standards.
Use Magento’s coding standards when you contribute to Magento’s codebase or create extensions.
