GREY HAT — THE COMPLETE SECURITY RESEARCHER TRAINING (298 pages) — Volume 3 of Landry Ngantchui's computing series, after 'Learn Hacking from A to Z' and 'Protect Your Systems and Data'. Become the researcher who finds flaws BEFORE criminals do: 12 dense chapters, 30 lab workshops and 36 fully guided step-by-step tutorials (goal, prerequisites, detailed steps, checks, common mistakes, commented solutions). Inside: build your own security lab, audit a network and a firewall rule by rule, hunt and neutralize malware on safe training samples, understand and defeat brute force, detect and fix SQL injections line by line, secure files and uploads, understand cracking to defend against it, and a complete end-to-end audit mission with a professional report. Everything is practised in YOUR OWN personal lab, fully legally: every flaw studied is chained with its fix and its detection. For students, technicians, administrators and future cybersecurity professionals. Author: Landry Ngantchui — Best Numerique.