Joomla is a content Management system written in PHP and MySQL. It is Open Source and free to use.
Database login and other settings are stored in file configuration.php.
Enable Debug
In configuration.php file, find
public $error_reporting = 'none';
Replace with
public $error_reporting = 'development';
To find Joomla version
grep 'public $RELEASE' libraries/cms/version/version.php
Joomla admin URL
https://your-domain/administrator/