Apache Groovy Courses
Udemy Groovy | Step by Step for Beginners
Udemy Automating Jenkins with Groovy
Pluralsight Groovy: Getting Started
Pluralsight WebServices/API Testing by SoapUI & ReadyAPI - Groovy |30+hr
Udemy Learning Groovy
LinkedIn Learning Apache Groovy 4 Fundamentals
Pluralsight Groovy Tutorial
Derek Banas via YouTube Groovy
Exercism What Can You Learn from Thousands of Source Files in Github
Devoxx via YouTube