OS Mastery Simple OS learning for a global audience Start Here

Topics

Enter the platform by domain when you want one system area fast, without losing the surrounding lessons, labs, and command reference.

Topics

Open one finished OS topic without browsing around.

Each topic hub gives you the lesson order, matching practice, related troubleshooting, and quick reference for one system area.

Open first topic Open Learning
Computer and Hardware Computer and Hardware Fundamentals

What a computer is, what the main parts do, and how hardware, firmware, and the operating system fit together.

6 lessons 3 labs 3 problems
6 quick reference links inside Open topic Processes Processes

Programs, processes, services, CPU, memory, and performance diagnosis.

8 lessons 7 labs 5 problems
8 quick reference links inside Open topic Files and Storage Files and Storage

Paths, folders, search, disks, partitions, filesystems, and mounts.

17 lessons 14 labs 8 problems
11 quick reference links inside Open topic Users and Permissions Users and Permissions

Accounts, groups, ownership, access control, and elevation.

6 lessons 12 labs 3 problems
4 quick reference links inside Open topic Networking Networking and Internet

Addresses, DNS, routes, ports, connectivity, firewalls, and remote access.

9 lessons 4 labs 3 problems
4 quick reference links inside Open topic Software Software and Packages

Package management, installation, updates, repositories, and dependencies.

5 lessons 4 labs 3 problems
2 quick reference links inside Open topic Automation Scripting and Automation

Shell confidence, text processing, scripts, and repeatable OS work.

12 lessons 7 labs 3 problems
2 quick reference links inside Open topic Security and Recovery Security, Operations, and Recovery

Logs, startup, updates, backup, services, hardening, and recovery.

9 lessons 6 labs 3 problems
6 quick reference links inside Open topic