Please see the following resources for more information on the GRUB 2 boot loader:
/usr/share/doc/grub2-tools-version-number/ — This directory contains information about using and configuring GRUB 2. version-number corresponds to the version of the GRUB 2 package installed.
info grub2 — The GRUB 2 info page contains a tutorial, a user reference manual, a programmer reference manual, and a FAQ document about GRUB 2 and its usage.
grubby(8) — The manual page for the command-line tool for configuring GRUB and GRUB 2.
new-kernel-pkg(8) — The manual page for the tool to script kernel installation.
Installable and External Documentation
/usr/share/doc/kernel-doc-kernel_version/Documentation/serial-console.txt — This file, which is provided by the kernel-doc package, contains information on the serial console. Before accessing the kernel documentation, you must run the following command as
yum install kernel-doc
Red Hat Installation Guide
— The Installation Guide provides basic information on GRUB 2, for example, installation, terminology, interfaces, and commands.