Swift 추천 사이트
https://www.swift.org/documentation/
https://bbiguduk.gitbook.io/swift
Swift 변경 사항 정리
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/revisionhistory/
https://github.com/apple/swift-evolution
raywenderlich.com의 Swift 스타일가이드
https://github.com/swift-kr/swift-style-guide-raywenderlich/blob/master/ko_style_guide.md
반갑습니다