I've used Buildroot in the past to make very specific linux build. It has a little bit of a learning curve but you end up with a linux that you control pretty m

I've used Buildroot in the past to make very specific linux build. It has a little bit of a learning curve but you end up with a linux that you control pretty much every aspect of it. https://buildroot.org/ https://buildroot.org/ If the goal is more educational LFS is a terrific tool that shows you pretty much everything that goes into building an OS and from there you can make it as minimal as you want https://www.linuxfromscratch.org/ https://www.linuxfromscratch.org/