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Advice For New Users On Not Breaking Their Debian System

Debian is a robust and reliable system, however users with root access can make any change they want. As such, it's very easy for new users to break their systems by not doing things the Debian way. This page lists common mistakes made by new users. Some of the things listed here can be done safely, but only if you have enough experience to know how to fix your system when things go wrong.

https://wiki.debian.org/DontBreakDebian