"Run this command and tell me the output"
"Run this script as admin/root"
"Go into these folders and delete these files"
"Add these lines to these files (Linux)/Registry (Windows)"
and of course the famous:
"Reset/Refresh/Reinstall" catch-all.
The problem is exponential complexity of interactions of various systems, hardware and software, and almost nobody really seems to know the exact workings and interactions of the system. At least no one on web forums.