gradle knows... No, the shadow knows...
Groovydoc, grails taglib testing, ratpack 101, Spock tips
GR8Conf EU aftermath: RxGORM, Grails and Alexa Skills, Geb cool tricks...
Reflection posts, groovy vert.x and a great Grails Screencast
Understanding Gradle, learning Groovy and deploying Grails
Groovy / Grails Performance monitoring, testing and network libraries links
Master the Grails Fields Plugin
Continuous delivery with Gradle, Groovy, Spock, docker ...
Learn how to build Grails 3 Plugins (from bintray setup, to publishing and testing)
Geb, Grails and lots of Gradle Plugins!!!