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In this video, I want to explain the different phases that are happening when you are booting

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Linux. It all starts on the top with the firmware. The firmware is your hardware. And from your

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hardware, you get to either the UEFI or BIOS. And then the part that is interesting for

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Linux is going to start. And that will be where on disk, the GRUB2 bootloader is loaded.

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The GRUB2 bootloader is loading the kernel. And the kernel is coming together with the

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init RAMFS, the initial RAM file system. Then kernel is loading PID1. And PID1 is going

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to add systemd. And systemd is the manager of everything. And in systemd, there are two

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phases that can be distinguished. There is the phase of what I will call early boot.

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Early boot is about all the essentials in the systemd environment. Next, there is also

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the part where the services are loaded. And once the services are loaded, you are going

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to load your shell. And the shell is where the user is going to log in.