Stage 1 of 7 · 10 lessons · ~2 months

Swift fundamentals

Learn the language your apps will be written in before touching UI code. Null safety, collections and async code matter more on mobile than most beginners expect.

Start: Constants, variables and types

Lessons· one lesson for each topic, in this order

Start with

CourseFree
100 Days of SwiftUI
Paul Hudson (Hacking with Swift) · Beginner
Days 1 to 15 teach Swift, with a checkpoint exercise every other day

Practise

Exercism
Dart, TypeScript, Kotlin and Swift tracks with small exercises and free mentor feedback

Keep handy

The Swift Programming Language
Apple's language guide: read the optionals, closures and structures chapters

Also worth your time

Beginner's Guide to Object-Oriented Programming (OOP) (opens in a new tab)Read
Classes, encapsulation and polymorphism, which every app model and data layer relies on
Grokking Data Structures & Algorithms for Coding InterviewsGo deeperPaid
Once the language feels natural: the data structures mobile coding rounds still ask about

Before moving on: Solve 15 exercises on Exercism in your language, then write a small console program, such as a to-do list or a grade calculator, that uses classes, collections, error handling and one async call.

Tauseef's advice

iOS development needs a Mac with a recent Xcode, so sort that out before you start. Spend real time on optionals and on structs versus classes, because SwiftUI is built on value types and they will confuse you later otherwise.