scrcpy is a tool that let's you control and view your Android device from your desktop.
Some info on getting the binary (fast) Nvidia driver and how to make it compile when a new kernel is installed
How to use sudo to run a command over ssh
How to create your own root certificate authority for easy certificate creation
How to make a git repository accessible via the web
Increasing security by implementing a password policy
A short how-to on installing and configuring logcheck. Logcheck is a tool that analyses logfiles and e-mails possible suspect log entries.
How to synchronize the local system time with a time server
How to install and setup rkhunter
Installing Xfce on Debian 9 and customizing the look and feel