This article covers some useful Linux commands to help you get started with working efficiently with Linux system. When operating a Linux OS, you need to use a shell — an interface that gives you access to the operating system’s services. Most Linux distributions use a graphic user interface (GUI) as their shell, mainly to provide ease of use for their users.That being said, it's recommended to use a command-line interface (CLI) because it’s more powerful and effective. Tasks that require a multi-step process through GUI can be done in a matter of seconds by typing commands into the CLI.How to use the cd command in Linux ?To navigate through the Linux files and directories, use the cd command. It requires either the full path or the name of the directory, depending on the current working directory that you're in.There are some shortcuts to help you navigate quickly:cd .. (with two dots) to move one directory up.cd to go straight to the home folder.cd- (with a hyphen) to move to your previous directory.How does the ls command works ?The ls command is used to view the contents of a directory. By default, this command will display the contents of your current working directory.There are variations you can use with the ls command:ls -R will list all the files in the sub-directories as well.ls -a will show the hidden files.ls -al will list the files and directories with detailed information like the permissions, size, owner, etc.