A GNU Grub guide which is specially designed for newbies and focuses on the fields as below
MBR, boot sector, boot loader
Backup & Restore boot loader
Grub stage1, stage2, stage3 and relation among them
Making Grub Floppy
Making Grub CD
Making Grub Pen drive
stage1 and stage2 on different media
Grub’s device and device.map file
Grub Rescue
Super Grub Disk
Grub’S GUI configuration
Manual booting with Grub shell
Disk investigation with Grub