- Title: The Swift Programming Language
- Author: Apple, inc.
- Description: The official "Swift book" published by Apple.
- Link: https://docs.swift.org/swift-book/documentation/the-swift-programming-language/
This seems obvious, but I've been learning Swift myself, and I've found that the official book you can find on the Swift website is pretty easy to follow. It does require some other Programming experience to really get the most out of it, but I've found it fairly accessible overall.