As a one time noob I may have done this once or more.

To get one thing working I borked everything.

Understanding permissions is pretty basic. But understanding permission requirements for system and user apps and their config and dirs can be a bit overwhelming at first.

Thinking a little change to make your life simpler will break something else doesn't always register immediately.

Shit, even recently, wondering why my SSH keys were being refused and realising that somehow i set my private keys world readable.

Thank god SSH checks file and dir permission.