I am currently working as a backend developer, but before I challenged myself to develop an app, I took this course and gained really useful insights. I was very impressed with the comprehensive coverage of everything from discovering overall ideas to marketing and advertising strategies. In particular, the advertising monetization strategy, how to maintain a harmonious user experience, and specific tips for increasing eCPM were practical enough to apply not only to app development but also to various types of projects. In the marketing-related part, the instructor covered viral marketing, how to use social media, and advertising optimization strategies in depth, giving me confidence that I could easily apply them to business models other than apps. The course was based on real cases and the instructor's experience, so the content was specific and persuasive, and it provided a balanced learning experience by covering technical aspects while also providing a business perspective. I highly recommend this course to anyone who is considering app development, marketing, or advertising!