Developing for Apple
https://appstoreconnect.apple.com/
https://developer.apple.com/app-store/small-business-program/enroll/
https://developer.apple.com/design/
https://developer.apple.com/develop/
https://developer.apple.com/xcode/swiftui/
https://developer.apple.com/app-store/
https://developer.apple.com/app-store/submitting/
https://developer.apple.com/ios/submit/
https://help.apple.com/app-store-connect/
Taxes
https://www.irs.gov/businesses/tax-treaties-can-affect-your-income-tax
In-app Purchases