Cybersecurity, learned like a practitioner.
24 learning paths · 398 modules live · every lesson written by someone who has shipped the control or run the engagement. Free to start.
Networking · modules
OSI layers, TCP/IP, subnetting, packet analysis — the foundation of every security skill.
VPN Fundamentals — IPsec, OpenVPN, WireGuard and the Math That Makes Them Work
A VPN tunnels Layer 3 (or Layer 2) traffic over an untrusted network, with confidentiality, integrity, and authentication. The three protocols you need to know are IPsec (the enterprise default), OpenVPN (the legacy SSL VPN), and WireGuard (the modern lightweight default). This m
Firewall and ACL Design — Stateless, Stateful, NGFW, and the Rules That Survive 5 Years
A firewall is just a structured list of "allow / deny" rules applied to traffic. Stateless ACLs filter packet by packet; stateful firewalls track connections; NGFWs add Layer 7 inspection. The trick to firewall design is not picking the product — it is designing rules that are ex
Advanced Routing and VLANs — Static, OSPF, EIGRP, and Where Trust Boundaries Actually Live
Routing is how packets find their way across networks larger than a single broadcast domain. This module is the working introduction to routing tables, longest-prefix match, static routes, OSPF, EIGRP, redistribution, and the VLAN model that segments a single switch into multiple
Network Protocols Deep Dive — ARP, DHCP, ICMP, DNS, HTTP and the Trust They Assume
Protocols are contracts between machines. Most of the protocols the Internet runs on were designed in the 1980s assuming everyone on the wire was friendly. They are not. This module dissects the seven protocols you must know cold — ARP, DHCP, ICMP, DNS, NTP, HTTP, TLS — and the t
Practitioners who've
shipped the controls.
Every module is written by someone who has built the defence or run the engagement. No repackaged tutorials, no generic theory.
Why learn here
Practitioner-written.
Each lesson is authored by someone who has shipped the control or run the engagement in production.
Quiz after every module.
20+ questions with explanations. 70%+ to mark complete. Unlimited retries.
Progress tracked.
Completions, scores and streaks saved automatically. Resume exactly where you left off.
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