Command: ls

Inside a folder you can list all the files that the folder contains using the ls command:

Command: cd

Once you have a folder, you can move into it using the cd command. cd means change directory. You invoke it specifying a folder to move into. You can specify a folder name, or an entire path.

Command: mkdir [enter dir]

You create folders using the mkdir command:

Command: rmdir [enter dir]

Just as you can create a folder using mkdir , you can delete a folder using rmdir

Command: mv [enter dir] [new name]

Once you have a file, you can move it around using the mv command. You specify the file current path, and its new path:

Command: cp

You can copy a file using the cp command:

Command: whoami

Type whoami to print the user name currently logged in to the terminal session:

Command: passwd

The passwd command in Linux is a powerful tool that allows system administrators and users to manage password-related tasks. 

Command: su

While you're logged in to the terminal shell with one user, you might have the need to switch to another user.

Command: sudo

sudo is commonly used to run a command as root. 

You must be enabled to use sudo, and once you do, you can run commands as root by entering your user's password (not the root user password).