The Understanding Boot PROM Fundamentals Course introduces the basics of Boot PROM. It describes the Boot PROM commands and identifies the boot device of the system. It also covers creation of custom device aliases and modifying NVRAM Parameters from the OS. Additionally, the course discusses the concepts of GRUB. It explains the method for modifying the system boot behavior, discusses GRUB boot archives, and covers the concept of booting a system in a GRUB-based environment.