Very good platform to learn Kotlin. I am using Hyperskill to learn Kotlin, with both the web version and the Android application. I especially like "The problem of the day" and the option of being able to review the concepts already seen.

Kotlin Core - Very usefull The teaching method in Hyperskill is great. First you select a project and you start learning topics about the project. In the topics there is two step. Technical and practical. After reading article about the topic you solve some problems about it. After finishing all topics you start writing codes about your project. This way is so usefull because you make lots of practice about topics and it makes you learn them permanently.

No daily life replenishment The app started out great, it was quirky, fun, and intuitive. I was planning on using this daily. About the 2nd or 3rd day I got a few questions wrong, and eventually spent my daily lives limit. Came back the next day enthusiastic and the lives never replenished! I figured it was a glitch. 3rd day, same result, no more lives. I waited a week and still nothing. So I uninstalled the app

General Review Of Hyperskill What made my experience great is first the design of the whole platform its so intiutive, well organised, and technically curated. second its the content its bite sized into small bits that you can easily learn in a very short space of time. Third is the engagement metrics they are also nice. Fourth is the constant update of the content whenever new things pop up there are changes and adjustments. Fifth would be i dont know its just loveable to use the platform.

The best place to practice skills The best place to practice skills that I have found. They are not trying to be hip and clever, just straight up skill development. There is enough repetition and enough exercises to produce actual learning. One drawback is the semi-gamifying of the platform. Sometimes getting it wrong is instructive, but if you run out of lives, too bad, wait until tomorrow. Even DuoLingo does better than that.