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- All right, let me give you an overview,

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of everything that's involved
in the boot procedure.

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Booting starts with either BIOS or UEFI,

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where BIOS is the old standard

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and UEFI is a new standard.

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So from BIOS or UEFI also
referred to as the firmware,

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you are going to find a disk.

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And next on disk you
will find the next part.

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That's the Grub2 Boot Loader.

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This grub2 boot loader,

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is responsible for loading the kernel.

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And this kernel needs access to drivers.

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And that is why the kernel comes together,

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with the initramFS,

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sometimes also referred to as the initRD.

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This initramFS is created
while you install your system

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and it contains all the drivers,

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for the heardware that was detected,

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upon the insulation procedure.

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And next one, when kernel
in initramFS are loaded,

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you are going to get into System D,

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that is a service manager,

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that is taking care of everything else.

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And once System D has gone through,

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the different boot phases,

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you'll get a shell from
the shell you can log in

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and that's what you need to
keep in mind while booting,

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because for troubleshooting
it's pretty important,

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that you are capable of identifying,

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where exactly it is going wrong

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and we are going to analyze that.

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But this is the big picture.