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.

I so far found it a great platform I recently came across the platform by way of a web search on a technical subject; I decided to read on and explore the site. I'm currently a non-paying member enrolled in the data science study plan. I find the project- (portfolio-) based training constructive as well as the grouping of topics towards a given domain, e.g. data science. I already have a background in Engineering and found the topic coverage suitable and looking forward to complete a project; I will likely become a paying member.

Improvements It's a good learning platform, however there is a bunch of ambiguous questions with unclear answers or questions with wrong andwers in React js where there is said to remove the App.js file.

Best platform to learn Java and Kotlin The code reviews help you adopt best coding practices, the integration with IntelliJ is fantastic and I love the way the lessons are written in a concise way, much better than video in my opinion. Oh! and the exercises are great!

Learning is like a video game The fact that there are exercises and projects in every theory section. I believe you should provide the solution or some hints, cause sometimes exercises are more complicated than theory.