Account/data management

I am working on a social media app called "Aura Tracker" where people can add/subtract aura from people based off of their actions. I am new to app development so I don't know how to handle user accounts and aura value changing. Content view code:

import SwiftUI
struct ContentView: View {
    var body: some View {
        ScrollView{
            
            VStack {
                Text("Aura Tracker")
                
                Image(systemName: "sparkles")
                    .imageScale(.large)
                    .foregroundStyle(.yellow)
                
                Text("You have "+"#"+" aura")

            }
        }
    }
}

#Preview {
    ContentView()
}

Aura_TrackerApp code:

import SwiftUI

@main
struct Aura_TrackerApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}