IntelliJ keystroke

https://alvinalexander.com/mac-os-x/common-intellij-idea-keystrokes-i-use-scala

https://www.jetbrains.com/help/idea/2016.3/navigating-through-the-source-code.html

https://www.jetbrains.com/help/idea/2016.3/keyboard-shortcuts-you-cannot-miss.html