To write great code, you need to learn what tools are available in your toolbox. This applies to building apps and understanding the features UIKit has to offer, but it also applies to the language you use to write software in. Different languages come with various features, best practices, pros, and cons. The deeper your understanding of the language you work with, the better the decisions you can make about the code you write. As mentioned before, Swift's type system is one of the features that makes Swift such an excellent language for both experts and beginners to develop in.

Before you dive into the details of Swift's types and how they compare to each other, it's essential that you know what types Swift has to offer you. On a high level, you can argue that Swift has two types:

• Reference types
• Value types

Let's have a closer look at each type to see what they mean, how they work, and how you can use them.