Understand systems.
Build your defenses.

A clear, practical reference for learning cybersecurity. Explore practical guidance on operating systems, network security, and digital forensics.

WikiCyber

Knowledge from systems to security.

Operating systems

Network security

Digital forensics

Find the knowledge you need.

Windows Linux Cisco & networking Digital forensics

Build on a stronger
technical foundation.

Accounts, policies, PowerShell, and the foundations of a secure Windows system.

Permissions, services, account auditing, and practical command-line guidance.

Networking concepts, routing, and the configuration behind secure connections.

Event logs, system artifacts, and methods for understanding what happened.

Bring structure to an investigation. Start with context, preserve what matters, and compare the records that help explain an event.

linux · investigation

<span># Establish a starting point</span>
$ journalctl --since today
$ last -a
$ ss -tulpn

WikiCyber is a free educational project. Invited contributors develop articles, and assigned reviewers review drafts before publication.