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 ### Phase 3: Kernal initialization and Systemd
 
 **The kernal then takes over,decompressing itselft,checking hardware, and loading devices drivers and kernal modules. the init process(Systemd in modern linux system) starts, managing all other processes. Systemd handles various tasks: loadng remainng drives,mouting file systems, starting background services(networking,sound,power management),managing user logins and loading the desktop environment. Systemd uses target configuration files to determine the boot mode.**
+
+# Linux FileSystem
+### Types of files
+ - Regular files : it contains programs, executable files and text files
+ - Directory : it is shown in blue color, it contains list of files.
+ - Special File : 
+    - Blocked file (b)
+    - Character devices file (c)
+    - Named pipe file (p)
+    - Symbolic link file (l)
+    - socket file (s)
+### Linux file system Hierarchy 
+1. Root Directory (/) : The top-level directory in the Linux file system. All other directories are subdirectories of this root.
+2. Important Directory: 
+ - /bin: Contains essential executable programs and core operating system commands. This directory is often linked to /usr/bin for convenience
+ - /boot: Holds files needed by the bootloader, including the kernel and initial RAM file system 
+ - /dev: Contains device files that represent hardware devices connected to the system
+ - /etc: Stores critical configuration files and startup scripts. For example, SSH settings are found in /etc/ssh/sshd_config
+ - /home: The home directory for individual users, similar to "My Documents" in Windows. Each user has a separate directory here 
+ - /lib: Contains shared libraries needed by programs 
+ - /media: The mount point for removable media, such as USB drives
+ - /mnt: Used for temporarily mounting devices
+ - /proc: A pseudo file system that provides information about running processes and system information
+ - /usr: Contains most of the user commands and utilities 
+ - /var: Holds variable files such as logs and temporary files
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