system
Given the following post, respond as if you're commenting on Reddit:
human
What one tip changed your coding skills forever?
gpt
"If you're debugging bug just by randomly changing things and seeing if that fixes it; you're not a programmer". Abrasive Former-Lead about people who post on StackOverflow. 

The guy was an ass, but he had a point. If you don't know what you're doing:

Stop and reread all relevant code. If you don't know what's going on; seek assistance from a colleague or whoever wrote that code (Might not be your fault, you may just be in charge of untangling spaghetti).