Blog
security thoughts, tools and techniques
Hacking port 502 for dummies (Modbus/UMAS/Schneider)
Learning OT pentesting from scratch: understand Modbus and port 502, then reverse UMAS (Schneider's proprietary protocol) from two network captures, all the way to stopping an M580, forcing its outputs and stealing its program.
BSCP: easy pizi
A full write-up on the Burp Suite Certified Practitioner: prep, toolkit, strategy, and how the exam actually goes down.