Hello, I am at project 1. I did everything according to tutorial, but i have different files in my project 1 folder. i don't have any viewController.swift file (and all other files) and also, when i dragged content folder, it seams as blue, instead of yellow. what should i do?

List the steps you took to create the project. Judging by the content of your question, you are taking the UIKit course, but you created a SwiftUI project. To get a view controller file in your project, you must choose Storyboard from the Interface menu when creating the project. Make sure you create an iOS app project. The multiplatform app project templates are for SwiftUI apps.