How does navigation work in SwiftUI?

beginner

Re-explain

SwiftUI provides several navigation mechanisms:
NavigationView/NavigationStack (iOS 16+):

NavigationView {
    List {
        NavigationLink("Detail", destination: DetailView())
    }
    .navigationTitle("Main")
}

Sheet Presentation:

@State private var showingSheet = false
Button("Show Sheet") {
    showingSheet = true
}
.sheet(isPresented: $showingSheet) {
    DetailView()
}

Alert and ActionSheet:

.alert("Error", isPresented: $showingAlert) {
    Button("OK") { }
}

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