You probably know about JBA / Hyperskill platform. It allows learning different languages (including Kotlin) not by reading books, but by solving almost-real-life problems step-by-step. Sadly, the theoretical part of Kotlin track is not as good as it could be so there is some effort to improve it. What we miss is a core around which we can build different topics. We’ve discussed it and decided that the best core is the list of kotlin idioms. Of course, the language is developing and even the creators are not always able to keep track of this development. Some idioms are present in the documentation, but surely there are some things missing there. Therefore, please - look at the existing list and add your own ideas, if you do not find it there. We will update the list as we go.
Here is the form: https://forms.gle/saauMhbWvfPTiK3o9