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Intermediate4 lessons85 minutes

Users, sudo and SSH access

Create accounts, grant privileges with sudo, and secure SSH with keys — without ever locking yourself out.

A production server never belongs to one person, and nobody works on it as root. This course covers who can do what on a Linux system, how to grant exactly enough, and how to close the most attacked front door on the internet.

What you will be able to do

  • Know who you are on a system and which groups you belong to
  • Create and remove accounts cleanly, with or without their data
  • Grant privileges with sudo without opening a back door
  • Move SSH to key authentication and turn passwords off

Outline

  1. 01

    Accounts and groups

    Who exists on the machine, and how the system knows.

  2. 02

    Privileges and remote access

    Raising your rights without becoming root, and closing the front door.

Technical content last reviewed on 2 August 2026