• Firewalls, Intrusion detection system ( IDS ), Intrusion Prevention system ( IPS ) - workings, use & types

ICS/Scada Operations

Basics of ICS Pentesting (paid/free) -

Paid

• Fundamentals of ICS/SCADA CyberSecurity - Definately recommend it. if you want to understand faster and everything is covered there.!!!

Free

• What is ICS, Scada, HMI mainly.
• understand concept of MTU, RTU.
• Difference between IT and OT Security and what's the main difference in both compared to other.*
• OT is vulnerable in nature but what makes it vulnerable and why we can't resolve it by encryption.
• Understand ICS protocols for example Modbus, S7, Profinet, Profibus and various other.

IMPORTANT - We can infiltrate in ICS as per configured environment and all depends on the victim's environment. you just have to explore many amazing things by yourself :) (just research)

Learning Resources!!

• ICS-Pentesting-Tools
• Awesome-IndustryControlSystems
• ICS-Security-Tools
• ICS-Hacking
• Aweasome-ICS-WriteUps
• Awesome-IOT-ICS - Combined short tutorials of both ICS and IOT
• Infosec-reference-Scada
• ICS-Pentesting-Youtube - Watch this too
• SANS ICS - youtube
• ICS Village - youtube
• plcprofessor
• Brian Douglas
• Rick-Cen-Youtube
• How to Pentest ICS Environments
• Pentesting-ICS-Systems--Overview - by Infosec Institute
• Pentesting-ICS-Systems--Methodology - recommended
• scadahacker
• ICS cybersecurity academy
• Cutaway-Security - youtube
• Cutaway-Security-Github
• A Collection of Resources for Getting Started in ICS/SCADA Cybersecurity
• controlthings.io
• ICS and PLC Pentesting and Hacking
• Free Industrial Control System (ICS) Cyber Security Training Course
• CISA Training - Recommended
• CISA's Training Portal - Recommended

ICS Books

• Pentesting Industrial Control Systems - Packt publishing.
• Industrial Cybersecurity: Efficiently monitor the cybersecurity posture of your ICS environment - Packt publishing.
• Hacking Exposed Industrial Control Systems: ICS and SCADA Security Secrets & Solutions - Multiple Authors.