Congratulations, you now have the Kotlin programming language and a powerful development environment to write it with. Now there is only one thing left to do: Learn to speak Kotlin fluently. First order of business – create a Kotlin project.
Open IntelliJ. You will be presented with the Welcome to IntelliJ IDEA dialog (Figure 1.2).
Figure 1.2 Welcome dialog
(If this is not the first time you have opened IntelliJ since installing it, you may be brought directly to the last project you had open. To get back to the welcome dialog, close the project using File → Close Project.)
Click Create New Project ...