*Caution: Outdated Content* This content was created in 2020. Since it is quite old, it may not be compatible with the latest versions, so please use it for reference purposes only. This is a course on Coroutines in the Kotlin language. Recently, the usage rate of Kotlin has increased. Google announced that Kotlin is used in more than 70% of the top 1,000 apps on Google Play. Along with the growth of the Kotlin language, the language itself is also evolving. The Coroutines feature, which was added relatively recently, provides groundbreaking functionality that was previously unprecedented. However, the learning curve is just as significant. Fortunately, I was able to organize the concepts of Kotlin Coroutines through various materials scattered online and kotlinlang.org.

*Warning: Outdated Content* This content was created in 2017. Since it is quite old, it may not be compatible with the latest versions, so please use it for reference only. This is a course on the Kotlin programming language. Google recently officially added Kotlin as an Android development language. However, there is currently a lack of translated books or materials for learning Kotlin in Korea. While kotlinlang.org has well-organized information about Kotlin, it is only available in English. Therefore, I have studied kotlinlang.org myself and summarized the content into videos. I have compiled these materials in hopes that they will be helpful to others studying Kotlin.