1 Grails Training
Grails Training - Developed and delivered by the folks who created and actively maintain the Grails framework!.
2 Grails Logging
This Quickcast introduces several tips and tricks related to logging with a Grails 3 application. It discusses the changes to logger names in Grails 3.3 and things to bear in mind when logging in Grails artifacts and Groovy POGOs. Moreover, it explains the benefits of using Slf4j, parameterized logging, how to configure rolling logging, how to use an external configuration file, etc.