2.9. Additional Resources
2.9.1. Installed Documentation
/usr/share/doc/grub-<version-number>/— This directory contains good information about using and configuring GRUB, where <version-number> corresponds to the version of the GRUB package installed.
info grub— The GRUB info page contains a tutorial, a user reference manual, a programmer reference manual, and a FAQ document about GRUB and its usage.