I learned Java with government funds, and because I felt it was lacking, I studied various Java lectures and books before getting a job. The company I got a job at used Kotlin instead of Java, so I had to study separately by just copying and pasting already-made projects, but I was scared to buy a book and study from the beginning. And since both are languages that run on JVM, I wondered if there would be a lecture that could explain the similarities and differences, but I was really satisfied and listened to it. To be honest, as I studied, I found Kotlin prettier and more fun than Java... I want to learn Kotlin more deeply.