Documentation

• A Swift Tour - A brief overview of Swift
• The Swift Programming Language - The official Swift language guide
• Swift Standard Library - Documentation for basic types like Int, String, Array, etc.
• Apple Developer Documentation - Documentation for Apple frameworks and libraries
• SwiftUI Tutorials - Apple's official SwiftUI guided walkthrough

Apple's developer website lists even more resources for Swift and iOS development.

Other Websites

• Swift by Sundell
• Hacking with Swift
• Xcode Tips
• SwiftLee

Memes

• a meme page to check while Xcode is indexing files
• Text from Xcode (a bit dated, but still funny)