Reference

Free, practical cybersecurity cheat sheets — the commands, flags and checklists worth coming back to, each with a visible last-verified date and none of it behind an email form or a PDF wall.
New here? The Cyber Kill Chain maps every sheet below onto a stage of a real attack — a good place to start.
The offensive chain runs end to end: map a target with the OSINT & recon sheet, scan it with Nmap, make sense of what's open via common ports, catch a shell with the reverse shell sheet, then climb with Linux privilege escalation.
The AI-security set covers what everyone's asking about: the OWASP LLM Top 10, prompt injection, jailbreak techniques, AI agent security and RAG security — with a hands-on LLM security lab to practise on.
On the blue-team side, watch the wire with tcpdump, read Linux logs with journalctl, search them at scale with SPL, and triage a suspicious file safely with malware analysis sandboxes. Everything is written to be scanned in seconds and trusted — spot something out of date? Tell me.