Official

• App Store / Swift Playground Learn real coding the fun way

Curriculum, roadmaps

• roadmap.sh/swift-ui

misc.

• SwiftUI.Blog by Nicola De Filippo
  • index
  • Swift in five minutes
• ROP: Railway Oriented Programming in Swift
• exercism / Swift

Books

• Mastering Swift Package Manager. Build and Test Modular Apps Using Xcode by Avi Tsadok - 211 pages

Concurrency

• Modern Concurrency on Apple Platforms. Using async/await with Swift by Andrés "Andy" Ibañez - 202 pages