User and Group Management: `useradd`, `usermod`, `groupadd`

In Linux, managing users and groups is crucial for security and organization. Every file and process has an owner, and permissions are often set based on user and group affiliations.

This lesson will teach you how to create, modify, and remove user accounts and groups.

The useradd command creates a new user account. By default, it creates a new primary group with the same name as the user and assigns a unique User ID (UID).

You'll often need sudo (superuser do) privileges to run this command.