Saving and fetching to Core Data

I am trying to save to Core Data so when the App is reopened the data will be there.
I have a single ViewController, within that VC I have 10 Text Fields which the user inputs their data (numbers). I have a function where I add all the data for the 7 days (sun - sat) and it shows the total value.
I have most in place (xcdatamodeld)...
Is it possible to have CoreData fill text fields?
Is there a good tutorial on completing core data? Most I have read and watched all use table views for the example.What I want to do is have the same data show up after closing and re-opening the App.

Code Block 
  // MARK: - Core Data stack
    lazy var persistentContainer: NSPersistentCloudKitContainer = {
    
        let container = NSPersistentCloudKitContainer(name: "Numbers")
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
                 
                /*
                 Typical reasons for an error here include:
                 * The parent directory does not exist, cannot be created, or disallows writing.
                 * The persistent store is not accessible, due to permissions or data protection when the device is locked.
                 * The device is out of space.
                 * The store could not be migrated to the current model version.
                 Check the error message to determine what the actual problem was.
                 */
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
        return container
    }()
    // MARK: - Core Data Saving support
    func saveContext () {
        let context = persistentContainer.viewContext
        if context.hasChanges {
            do {
                try context.save()
            } catch {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
                let nserror = error as NSError
                fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
            }
        }
    }