[Solved] Which updates actually update the core files?

Which of the updates on applying overwrites the config values? Which of these only update the core files and do not make any changes to config.?
As I have to revert changes back to working values every time on updating these, which of these are not required to be updated?

No package will overwrite anything in /etc/ folder. If it will overwrite for some reason debian will ask and show diff. This is internal deb behavior.

:+1: Thanks