Reference

“You don’t have to know everything. You simply need to know where to find it when necessary.” – John Brunner

Kotlin

• /r/kotlin
• Kotlin Language
• Kotlin YouTube channel
• Kotlin: An Illustrated Guide
• Kotlin Playground

JavaFX

• JavaFX Home
• JavaFX Documentation Project
• JavaFX CSS Guide
• Atlanta JFX Theme
• ControlsFX Widgets
• JFXtras Widgets

Gradle

• /r/gradle
• Gradle Plugins
• Gradle User Manual
• Gradle Tutorial - Crash Course (video)
• JetBrains Package Search
• Gradle Plugins Search