This great open software usually makes it very easy to set up your smart mirror but does not support the Pi Zero W by default. A Pi 4 is too expensive right now for such a project but I still had a small Pi Zero W which would be perfect for this project – but is unfortunately not officially supported by the software I am going to use: MagicMirror².
While the hardware part is described in this article I needed to fix another problem first: Raspberry Pis are crazy expensive right now. Pi Zero booting up – the text seems to float on the mirror