This tutorial shows how to create new .swift File that will contain your custom Views.
When you have a lot of Views it is easier to organize them into multiple files.
Such File is just a collection of Views (there is no main/root View - they are all equal as File is concerned).
By telling XCode that you want to create new SwiftUI View File it only means that file will be created with some
predefined content that is usually needed for creating Views. You can also create Swift File and put all the code manually.
Name of the File doesn't have to collate with its content (like the names of the structs it holds).