This part of the Magento tutorial will provide detailed information regarding the Magento's default files and folders structure.
This tutorial will show you how to display error messages in Magento.
Exception printing is disabled by default for security reasons in a common error in Magento, learn how to debug, fix, enable error reporting of this error
E-commerce content management provider Magento issued several patches to fix XSS vulnerabilities.
Magento 2 Developer Guide.