User Management

Here is a list that will help us to better understand and deal with user management.

Command	Description
sudo	Execute command as a different user.
su	The su utility requests appropriate user credentials via PAM and switches to that user ID (the default user is the superuser). A shell is then executed.
useradd	Creates a new user or update default new user information.
userdel	Deletes a user account and related files.
usermod	Modifies a user account.
addgroup	Adds a group to the system.
delgroup	Removes a group from the system.
passwd	Changes user password.
cat /etc/shadow	to see passwords and users

How to List Users in Linux Command Line [3 Simple Ways]Linux Handbook