Joomla 's Debug mode allows you to view essential information, including errors. This gives you a better understanding of how to resolve them effectively.
Debug mode mainly informs you about the following errors.
Memory usage
Database queries
Profile information
Session data
How to activate debug mode in your Joomla site
To activate Debug mode in Joomla:
Log into your Joomla administration panel
In the "System" menu , click on the "Configuration" link
You should see several tabs listed at the top of the page. Click on the 'System' tab (1) and click'YES' on the'Debugging System' setting (2)
Then from the 'Server' tab (1) change the 'Error report ' value to 'maximum ' (2)
When you visit your Joomla site again, you should see a list of debugging information listed towards the bottom of the page (see screenshot below). This information will be under a heading called:Joomla! Debug Console
If you don't have access to your Joomla administration, you need to modify the configuration.php file via FTP by setting the $debug variable to 1. i.e.: public $debug = '1'; and by modifying $error_reporting to 'maximum'.
Conclusion:
You've learnt how to activate Debug mode in your Joomla. Debug mode allows you to view important information such as errors, which will help you correct the way your site works.