ModSecurity Courses

Secure Your Code - Injections and Logging
Pluralsight

Introduction to the OWASP ModSecurity Core Rule Set
nullcon via YouTube

Implementing AppSensor in ModSecurity
LASCON via YouTube

OWASP Flagship Projects - OWASP ModSecurity Core Rule Set
OWASP Foundation via YouTube

Practical OWASP CRS in High Security Settings
OWASP Foundation via YouTube

Core Rule Set for the Masses
OWASP Foundation via YouTube

Core Rule Set for the Masses: Lessons from Taming ModSecurity Rules at Massive Scale - 2017
LASCON via YouTube

Nginx ModSecurity Tutorial - Nginx WAF
HackerSploit via YouTube

Apache2 ModSecurity Tutorial - Apache2 WAF
HackerSploit via YouTube

ModSecurity as Universal Cross-Platform Web Protection Tool
Black Hat via YouTube