In recent years, digitalization has accelerated, and its scope of application has greatly expanded. Utilizing digital technology is essential not only for improving the efficiency of existing operations but also for creating new businesses. In particular, mobile apps are seeing increased demand across various fields, including B to C (business to consumer), B to B (business to business), and B to E (business to employee). More than ever, companies are required to respond optimally. However, there are cases where companies lack members with expertise and extensive experience in app development. Therefore, this time, we will compactly summarize the knowledge necessary for app development and the points to be mindful of.