Debugging
From Onset Developer Wiki
This is a quick newbie guide to what debugging is and how to do it.
Debugging is the process of adding messages into your code to provide insight of the script's process or working. The debugging helps us to find out where the issue occurs, which can help us where exactly our issue is present or is coming from. The errors in the code can be a huge problem as they can skip the code or crash the server where they occcur.