- [Learn to code with Apple - Apple Developer, official books](https://developer.apple.com/learn/curriculum/)
- [The Swift Programming Language (Swift 5.6) official book](https://books.apple.com/us/book/the-swift-programming-language-swift-5-6/id881256329)
- [About Objective-C, official Apple documentation](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Introduction/Introduction.html)
- [Stanford CS193p - Developing Apps for iOS course](https://cs193p.sites.stanford.edu/)
- [App Developer Training - Official tutorials](https://training.apple.com/appdeveloper)
- [Swift Algorithm Club](https://github.com/raywenderlich/swift-algorithm-club)