APT package manager is a built-in command-line tool for Debian-based distributions like Ubuntu to mange your applications in your Linux system.

DNF is the default package manager for RHEL-based distributions like Fedora and AlmaLinux to help you manage your system packages.

You are Arch based users, so I expect that you already know about the Pacman package manager; if not, it’s just a built-in command line tool to manage your system packages.

The grep command is used to perform regular expressions to find out strings and patterns from the file that match a regular expression.

The root account, or root user, has the highest privilege over the system, having complete control over it.

In Linux, we have a root user created by the system administrator and normal users, which are also created by the system administrator.

Sudo users have the most authority over the system, including the ability to install, remove, update packages, and modify system files.

A root or normal user can easily switch to another user account using the su command if they know their current or another user's password.

There are tons of reasons to switch to another user’s or the root user’s account, however there are multiple ways to do so, which we are going to learn today.

The su command is the most powerful command on Linux, giving anyone with access to another user’s account by knowing their current password if they have sudo privileges.

GNU nano is a built-in text editor for major Linux distributions, providing similar options to edit and modify files as its competitors VIM.

Vim is a popular text editor on Linux, providing advanced features and functionalities compared to its competitor, the GNU Nano editor.

Emacs is one of the aged text editor with ongoing development, providing rich and powerful features that can be more extended using plugins.

It is important for a Linux administrator to find out all the users in their current system so that they can adjust the rules and privileges for each one.

The cat command is pretty useful for reading, creating, and concatenating files. While the tac command also works similarly to the cat command, which outputs the last line first.

The compgen command is a very handy tool available in major Linux distributions that can help you find your system aliases, commands, directories, groups, jobs, users, etc.

Learn how to use the systemctl command, which helps you manage your systemd service in the modern Linux operating system.

Symbolic links, sometimes also referred to as "symlinks," are used to create file pointers pointing towards files and directories in the Linux system.

The systemctl mask and systemctl disable are both crucial commands for Linux administrators, and you must know their differences to decide which one to choose in certain situations.