How does the process of loading the Linux operating…

BIOS/UEFI: Hardware initialization, peripheral check, boot device selection.
MBR/GPT: Reading the contents of the Master Boot Record (MBR) or GUID Partition Table (GPT) from the boot device.
Bootloader (GRUB, LILO): Loading the bootloader. Displaying the boot menu (if available), selecting the kernel and initial ramdisk.
Kernel: Loading the operating system kernel into memory. Hardware initialization, mounting the root filesystem.
Initial Ramdisk (initrd/initramfs): Loading a temporary root filesystem into memory. Executing scripts to detect hardware and prepare for mounting the real root filesystem.
Root Filesystem: Mounting the real root filesystem specified in kernel parameters or initrd/initramfs.
Init System (SysVinit, systemd): Starting the init system. systemd is more modern and widely used.
- SysVinit: Starting services based on runlevels.
- systemd: Starting services in parallel based on units (services, targets, etc.).
```
# Example systemd unit
[Unit]
Description=My Application Service
After=network.target

[Service]
ExecStart=/usr/local/bin/my-app
Restart=on-failure

[Install]
WantedBy=multi-user.target
```
Runlevel/Target: Transition to the appropriate runlevel (SysVinit) or target state (systemd), starting necessary services (network services, graphical shell, etc.).
Login Prompt/Display Manager: Starting the login shell (terminal) or graphical login manager (GDM, LightDM, etc.).
User Login: User logs into the system. User session is started.

How does the process of loading the Linux operating system occur?