Result of Call Is Unused

Result of call to 'sorted(by:)' is unused

.sorted(by: ) 

returns the sorted array, if you need the sorted array and leave the original array untouched.

.sort(by:)

it doesn't returns anything, it sorts the original array.
If you don't care about original array being modified, then use .sort(by:)

Result of call is unused

You are confusing the results variable, which is, indeed, used inside the closure, and the result of the taskForDELETEMethod call itself, which is NSURLSessionDataTask object.

From the examples of using taskForDELETEMethod that I was able to find online it looks like it is perfectly OK to ignore the return value, so you can avoid this warning by assigning the result to _ variable, i.e.

let _ = taskForDELETEMethod {
    ... // The rest of your code goes here
}

Swift result of call to is unused

Assign the return value of the function to _ to explicitly discard it, like this:

_ = somethingThatReturnsAValueYouDontCareAbout()

Swift 3 warns about unused function return values, so you need to show it that you know what you're doing.

Swift Compiler Warning : Result of call to 'save(defaults:)' is unused

The DataHandling instance's save(defaults:) function technically returns a value, even if you don't use it. To silence this warning, assign it to _ to signify that you don't intend to use the result value, e.g.:

_ = ordering.save(defaults: indexPath.defaultsKey)

or

let _ = ordering.save(defaults: indexPath.defaultsKey)

Just to be clear, this is almost definitely not why your tableview is not loading data. It should be pretty insignificant. The indexPath.defaultsKey is being saved (assuming the API works).

SceneDelegate - Result of call to 'flatMap' is unused

You could rewrite like this:

func scene(_ scene: UIScene, continue userActivity: NSUserActivity) {
    if let url = userActivity.webpageURL {
        handlePasswordlessSignIn(withURL:url)
    }
}

But then you will still get a complaint, because now you are ignoring the result of handlePasswordlessSignIn! You can solve that by designating handlePasswordlessSignIn as being @discardableResult:

@discardableResult
func handlePasswordlessSignIn( //...

Result of call to 'rotationEffect(_:anchor:)' is unused

Rather than trying to return a a new View from inside a function that you call as a Button action, you need to modify a @State property that controls the rotation angle when the user taps the button.

struct RotatingView: View {
    @State private var rotationAngle: Double = 0
    let titleContent: String

    var body: some View {
        ZStack {
            VStack {
                Text(titleContent)
                    .fontWeight(.heavy)
                    .font(Font.custom("Benguiat Bold", size: 35))
                    .foregroundColor(.red)
                    .padding()
                    .rotationEffect(.degrees(rotationAngle))

                Button(action: {
                    rotationAngle += 180
                }, label: {
                    Text("Enter upside down")
                        .foregroundColor(.white)
                        .font(.title2)
                        .fontWeight(.bold)
                        .padding()
                        .border(Color.green, width: 3)
                        .cornerRadius(10)
                        .padding()
                })
            }
        }
    }
}

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