For the past 10 years, I have been moving evenly and rectilinearly in an inertial frame of reference called OpenSUSE.
I had to first read about creating Debian packages and look here:
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/tree/
Both Ubuntu and OpenSUSE distributions start with the kernel source package, which contains a set of scripts and rules for further build.
This has a sacred meaning.
To get started, I took two scripts from the v5.7-rcX