This document contains installation instructions for the Debian GNU/Linux 12 system (codename bookworm), for the 64-bit ARM (arm64) architecture. It also contains pointers to more information and information on how to make the most of your new Debian system.

KDE Customization Guide: 11 Ways You Can Change the Look and Feel of Your KDE Desktop
https://itsfoss.com/kde-customization/

La FAQ Debian GNU/Linux
https://www.debian.org/doc/manuals/debian-faq/