When defining a struct or class, I typically list all of my nested classes/structs first, then wrapped properties, then constants, then normal variables, then computed properties (with body as the last one), then init, then func.

I'm just wondering if there are rules as to how these whould be ordered or if people just do whatever they think is best?

[https://google.github.io/swift/] Provides a style guide. There are others and you may find educators or employers that have their own. Try google "swift style guide" and you will find something that suits you. But for now I would reccomend you just be consistent and not worry too much about it.

In HackingWithSwift projects, your code is small enough that you'll see enums, variables, etc all at the same time. But in more complex projects, these may be large chunks of code and you'll want some organization to find the enum, initializer, or variables that you needs.

While I won't suggest an order, I would suggest that you look into pragma marks. These will be very helpful for keeping your code organized.

See -> Finding Code in Large Source Files