Protocol Oriented Programming(POP) in Swift

https://www.pluralsight.com/guides/protocol-oriented-programming-in-swift

What is Test Driven Development (TDD)

https://www.guru99.com/test-driven-development.html

Swift - Tuples

https://www.tutorialspoint.com/swift/swift_tuples.htm

What is Git?

https://git-scm.com/book/en/v2/Getting-Started-What-is-Git%3F

Agile Methodology Tutorial

https://www.tutorialspoint.com/agile/index.htm

How to Increase my iOS Application Security

https://medium.com/wolox-driving-innovation/how-to-increase-my-ios-application-security-17681f068d11

https://medium.com/swift2go/application-security-musts-for-every-ios-app-dabf095b9c4f

What is Higher Order Functions?

https://medium.com/javascript-scene/higher-order-functions-composing-software-5365cf2cbe99

What is functional programming language?

https://www.tutorialspoint.com/functional_programming/functional_programming_introduction.htm

Swift - Generics

https://www.tutorialspoint.com/swift/swift_generics.htm

Tuples, Structs and Enums:: What are the differences?

http://chris.eidhof.nl/post/tuples-structs-enums/

Advantages of Objective-C over Swift

https://mlsdev.com/blog/51-7-advantages-of-using-swift-over-objective-c