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1.BIOS: Basic Input Output System

When Linux is booted, BIOS starts up and performs the Power-On Self Test Then POST checks the hardware operability of the components i.e. any hardware pieces such as / hard disk or SSD, keyboard, RAM and USB ports.and can be located through a direct installation on USB or DVD on Linux

When the POST process is complete and there are no problems, the BIOS will check the MBR for information about the bootloader and disk partitioning.There are 3 main types of bootloaders in Linux LILO GRUB GRUB2

LILO & GRUB: They have become excluded due to the passage of time

GRUB2: is the latest basic bootloader in modern Linux distributions GRUB2 stands for GRand Unified Bootloader version 2.Once the BIOS identifies the grub2 bootloader, it executes it and loads it into main memory (RAM).

1. BIOS/UEFI Initialization
   BIOS Integrity Check (POST)
   If the computer is not on -> When the user presses the power button, the boot process begins.

If the system is restarted -> The system is restarted using the user's graphical interface or the command line.

POST: It is a health check that performs a wide range of diagnostic checks.
BIOS: Basic Input Output System

When Linux is booted, BIOS starts up and performs the Power-On Self Test
Then POST checks the hardware operability of the components i.e.
any hardware pieces such as / hard disk or SSD, keyboard, RAM and USB ports.
An error message is displayed on the screen if a device malfunctions, such as a damaged SSD or hard disk, or even if some devices are not detected.
If the devieces are present and working as expected, then the boot process moves to the next stage.
If the devieces are present and working as expected, then the boot process moves to the next stage.
and can be located through a direct installation on USB or DVD on Linux

When the POST process is complete and there are no problems, the BIOS will check the MBR for information about the bootloader and disk partitioning.

There are 3 main types of bootloaders in Linux
LILO
GRUB
GRUB2

LILO & GRUB: They have become excluded due to the passage of time

GRUB2: is the latest basic bootloader in modern Linux distributions
GRUB2 stands for GRand Unified Bootloader version 2.
Once the BIOS identifies the grub2 bootloader, it executes it and loads it into main memory (RAM).
Of course the grub2 menu gives you a list to do several things, the most prominent of which is
Select the version of the lunix kernel you want to use