Swift

• Variables and Constants
• Strings and Characters
• Optional Chaining
• Operators
• Control Flow
• Functions
• Closures
• Arrays
• Sets
• Dictionaries
• Extension
• Enumeration
• Structures and Classes
• Properties
• Inheritance and Polymorphism
• Protocols
• Generic
• Automatic Reference Counting
• Concurrency

Frameworks

• URL Loading System in Foundation Framework
• Notifications in Foundation Framework
• Dispatch Framework
• Combine Framework

Others

• Design Patterns
• MVC
• MVVM
• VIPER

References

https://docs.swift.org/swift-book/documentation/the-swift-programming-language https://developer.apple.com/documentation/technologies