"The Debian Administrator's Handbook"[0]. Free, comprehensive, updated. Every other book is 2/3 at best. This also includes the venerable TLDP[1], which will've

"The Debian Administrator's Handbook"[0]. Free, comprehensive, updated. Every other book is 2/3 at best. This also includes the venerable TLDP[1], which will've perhaps recommended 15y+ ago. You can also choose the most practical approach and attempt "Linux From Scratch"[2]. [0]: https://debian-handbook.info/ https://debian-handbook.info/ [1]: https://tldp.org/index.html https://tldp.org/index.html [2]: https://www.linuxfromscratch.org/lfs/read.html https://www.linuxfromscratch.org/lfs/read.html (perhaps systemd vers better if wanna learn modern Linux)