Thanks for best answer. I‘m going to fill out the form in English.

Thanks. I’ll check them.

If you want to build an App, you should use Xcode. This is IDE, so you can develop on many languages. Xcode has SwiftUI, so you can easily build an app. And can Submit to AppStore.

Swift Playgrounds 4 come until this year. Sure. Apple say about. https://developer.apple.com/forums/thread/695470

Swift playgrounds has sessions for beginners. Learn to Code 1 &2. If you get and read about swift on Apple Books, you should get Apple’s or Apple Education’s. As you know, swift was developed by Apple, so Apple’s are greater than Third-party’s.

Swift playgrounds 4 is coming until end of this year! Apple say that on iPadOS 15 page say about swift playgrounds and its footnote say Available late 2021. https://www.apple.com/ipados/ipados-15/#footnote-1 https://developer.apple.com/videos/play/wwdc2021/102/ 0:34:00- We can’t wait new features!!!