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Needed video to explain something better

I had trouble with this video.
https://www.raywenderlich.com/5662524-your-second-ios-and-swiftui-app/lessons/7

At 1:40 and 2:11 it shows using the fix button to fill in the text “TaskStore”. What it doesn’t say is that if I don’t retype the text, I will get a syntax error because what is there is a placeholder. The fix button game me the text “TaskStore” and I just tried putting “()” after it, but this completely failed.