What is Java? There are a lot of things you can do with JAVA. It feels like it's being pushed back compared to backends using Spring and Kotlin, but it's still used for app development and embedded applications because there's a lot of data. If you're looking for the best course to lay the foundation before advanced use of JAVA, I recommend https://www.inflearn.com/course/android_java. It will help you learn the basics of Java so you can move on to the next step smoothly. Since it's free, I recommend you listen to it once If you want to learn more advanced Java concepts, https://www.inflearn.com/course/android-9-pie-1 If you want to learn the web, https://www.inflearn.com/course/%EC%8A%A4%ED%94%84%EB%A7%81-%ED%94%84%EB%A0%88%EC%9E%84%EC%9B%8C%ED%81%AC-%EC%9E%85%EB%AC%B8 You can listen to it more easily because it's a lecture by the same sharer. Apps were a typical use case for Java, but now Flutter is recommended, so https://www.inflearn.com/course/dart-%EC%96%B8%EC%96%B4-%EC%9E%85%EB%AC%B8 With this, you can solidify the basic concepts, https://www.inflearn.com/course/%EC%9D%B8%ED%94%84%EB%9F%B0-%ED%87%B4%EA%B7%BC%EA%B8%B8-%EB%B0%8B%EC%97%85-03-flutter and expand on them. The explanation is long, but going back to the beginning, I recommend https://www.inflearn.com/course/android_java which was the best lecture I took when I learned the basic concepts of Java. In addition, the instructor's voice is my style.😏