Although I personally haven’t got any experience with linux internals (insofar not needed as a user) I’d think https://www.kernel.org/doc/html/latest/ https://w

Although I personally haven’t got any experience with linux internals (insofar not needed as a user) I’d think https://www.kernel.org/doc/html/latest/ https://www.kernel.org/doc/html/latest/ might be a good place to start. You might want to find out how much actually is about system internals instead of administration. I think system internals are a much broader subject than what is needed to be a very good linux administrator.