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Swift Study Guide (All Topics Each Engineer Must Know)
3DaysOfSwift is an online course and members area (with downloadable resources) to learn the Swift programming language and start beginners on their journey in a brand new career writing software in the tech industry.
All Topics A Swift Engineer Must Know (to get a job in the tech industry)
Below is a copy of The Swift Study Guide outlining the topics you'll be required to know before applying for a job in the tech industry as an iOS Developer / Swift Engineer writing Swift software in Xcode for Apple products.
After The Swift Study Guide we describe how our online course can help teach these topics and provide a solid foundation of Swift knowledge that will lay a wonderful path of future self-study as you continue to spend years of your life learning the true power of the Swift programming language.
How do I Learn Swift?
Learn all topics in the Swift Study Guide below, write tested systems in code alone & don't waste time building or learning UI (user interfaces). You can achieve all this at 3DaysOfSwift.com.
Swift Study Guide
3DaysOfSwift.com | Online Swift Course
View Study Guide webpage
Beginner Topics
Topic 1: The Basics & Foundational Types
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/thebasics
Topic 2: Control Flow
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/controlflow
Topic 3: Optionals
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/optionalchaining
Topic 4: Functions
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/functions
Closures
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/closures
Topic 5: Classes
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/classesandstructures
Topic 6: Structs
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/classesandstructures
Topic 7: Enums
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/enumerations
Topic 8: Value Types
Reference Types
Topic 9: ARC (Automatic Reference Counting)
Mid-level Topics
Topic 10: Extensions
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/extensions
Topic 11: Protocols
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/protocols
Topic 12: Concurrency
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/concurrency
Topic 13: Error Handling
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/errorhandling
Topic 14: Generics
https://docs.swift.org/swift-book/documentation/the-swift-programming-language/generics
The 3DaysOfSwift Bootcamp
The 3-day intensive course is the introduction to programming every student needs to start learning Swift as a beginner and also learning how to use Xcode as the industry-standard tool for writing software for Apple products. This course offers a strong transformation from absolute beginner to Swift engineer who built a strong foundation of the language that can easily grow in size by learning more topics and more advanced features. This short bootcamp combined with the Developers Toolkit (available to download as part of their monthly subscription plan) is an unstoppable force on the internet to teach beginners and junior iOS Developers how to use Swift and become a great Swift Engineer. All of these resources offered as part of their monthly subscription plan are all you need to start your journey learning Swift on a path to applying for a job in the tech industry.
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Frequently Asked Questions
Do I need to learn SwiftUI to get a junior job?
No. Swift is required. SwiftUI can be learned on the job.
Is Swift hard to learn?
Swift is approachable but deep. Structured learning makes it manageable.
Can I learn Swift in a weekend?
You can start in a weekend, but mastery takes consistent practice.
Is Swift still worth learning in 2026?
Yes. Swift remains the foundation of the iOS ecosystem.
How do I prepare for Swift interviews?
Practice language features, not UI layouts. Use executable examples.
Summary: Learn Swift First, Everything Else Follows
If you want to learn Swift in 2026, focus on the language — not the noise around it. Free resources are abundant, but clarity is rare.
Platforms like 3DaysOfSwift.com exist to remove confusion, shorten learning curves, and help you build confidence where it matters most: in Swift itself.
If you’re serious about starting a career in iOS development, begin with Swift. Everything else can come later.
Our Free Products at 3DaysOfSwift.com
The Swift Cheatsheet ⚡️
123Calc Xcode Project
All products are free. Some require signup. All are designed to help you learn Swift faster — and properly.
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3 Days Of Swift Bootcamp
Learn Swift by enrolling in our 3-day online bootcamp. We have 3 days of instructional videos pair programming with our experienced instructor and Senior iOS Developer who guides you to write code for each main language feature of Swift.
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Swift Study Guide
Also, as an additional bit of help 3DaysOfSwift has the Swift Study Guide (listed below and to download), which is a list of Swift language features each iOS Developer should know before applying for jobs in the tech industry.
List of Swift Language Features
Download the list of topics (Swift language features) you will be required to know in order to pass an interview for an iOS Developer role.
View Study Guide Webpage
Beginner Topics
Topic 1: The Basics & Foundational Types
Topic 2: Control Flow
Topic 3: Optionals
Topic 5: Classes
Topic 6: Structs
Topic 7: Enums
Topic 8: Value Types & Reference Types
Topic 9: ARC (Automatic Reference Counting)
Mid-level Topics
Topic 10: Extensions
Topic 11: Protocols
Topic 12: Concurrency
Topic 13: Error Handling
Topic 14: Generics
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A Career in Swift
Also, as an additional bit of help 3DaysOfSwift has outlined a few career tips that might help as you start your journey as an iOS Developer applying for jobs writing software for Apple devices.
Tips 💡
Below we have included a few career tips to help get you started as a Junior iOS Developer working in the tech industry.
Focus on learning the Swift language itself. Most team members start their learning journey by studying Xcode and building apps. It's a lot of information and plenty to get confused about. Most of your colleagues will have many gaps in knowledge that affect their every-day anxiety with completing tasks and having it reviewed by others. Instead, why not become the one of the reviewers? Our advice is to stand out in the tech industry and if you want to stand out I would suggest becoming very knowledgable about the language itself; Every single developer will be using it and they will all be competing over Architecture and not the best use of language features. Armed with an incredible understanding of the language you will have the confidence in knowing you can maintain any existing product on the market.
Gather "Career Things" like they were collectibles in a game. This easy-to-remember and rather broad term is a great bit of advice. Too many engineers let the months go by without really taking on board many exciting projects or doing anything that wows any one. This is a terrible idea in every way. Stand out. Be the best at something (like understanding the language). When you change positions and apply to a different company you will have an interview and they'll grill you with many questions. The main bits to know are these; Your CV gets you the interview. You display your worth in the interview.
Your CV gets you the interview: Your short 2 page bullet-pointed CV is simply a list of amazing things you did to improve the team, the social element, the code quality, the income, how you increased user retention, how you added a successful feature and improved the app. You must collect career things.
You display worth in the interview: In the interview you want to fill the hour with saying similar phrases non-stop to "I was able to tweak the values and affect the income of the product simply by reducing the friction of the onboarding and providing a more seamless and pleasant user experience for the user. We now have only a 14% drop compared to most companies that have around 30% typically." Notice how you use "we" when referring to your current company in interviews. To simplify the phrase just-used, "I helped my company move forward. I improved the product, which led to an increased user experience and ultimately more profits for the company. I am a team player and I will improve your company at every opportunity possible."
Become confident in Interviews. You are now a talented Swift engineer who understands the Swift language and has a list of successful results you can pull out of the bag and discuss and any interview. You are constantly and infinitely talking about specifics of the Swift language and how cool and useful it is. You are stacking up one example after another of how you affected the results of the team and the company. You are great at telling these stories. The world is your oyster and you can be confident in your abilities as well as your choices in life.
Move company every 2 years. Ask for a £10,000 increase each time. When you become bored at your current job because you "know too much" then start thinking about moving perhaps - it's probably time to upgrade into a different role with a new title and annual salary.
Be driven and be proud that you help keep the world moving by maintaining the digital services we all love and are constantly glued to.
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Why not take our online bootcamp and learn Swift in a weekend?
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We are not affiliated with 100 Days of Swift. If you want to learn SwiftUI please visit HackingWithSwift.com.
Apple developer tutorials for SwiftUI can be found here.
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