@hello-world Here are a bunch of Groovy/Grails resources, https://github.com/virtualdogbert/Groovy_Links, a lot of the basics of groovy Grails haven't changed that much over time(controllers, service, domains, command objects), so some older tutorials can still help(although I wouldn't look to much on anything pre Grails 3) but do keep the docs in mind: https://github.com/virtualdogbert/Groovy_Links