I am interested in app creation. What should I do to learn app creation?

If you have basic programming skill that will really help you out . If not than you should start with basic HTML , C etc.

It depends on platform you want to design the app for like iOS and Android.

If you want to develop Mobile Application, then you need to select a platform first either android or iOS. Then start learning the programming languages which are required to develop applications. For Android, you should learn Kotlin or Java.

If you want to develop Mobile Application, then you need to select a platform first either android or iOS. Then start learning the programming languages which are required to develop applications. For Android, you should learn Kotlin or Java.

Install Android Studio and start learning Java language after completing the Java. Watch some Android studio tutorial videos. They will help you in learning that how to design your app and how to code it according to your need and then you can create your app.

Start from scratch. Use the platform like MIT App Inventor to create your own app from scratch. You can easily learn app creation through MIT App Inventor.