The WhyNotTry tutorial

https://www.swift.org/getting-started/swiftui/

Is there a better tutorial than this one. Can't seem to find a live youtube video that teaches it. I went to git hub and downloaded the source code but all it shows is a big round blue circle. I can't seem to get pass the below code without it giving me an error. I need to see this tutorial live. Any suggestions?

struct ContentView: View { var activities = ["Archery", "Baseball", "Basketball", "Bowling", "Boxing", "Cricket", "Curling", "Fencing", "Golf", "Hiking", "Lacrosse", "Rugby", "Squash"]

var selected = "Archery"

var body: some View {
    // ...
}

}

The WhyNotTry tutorial
 
 
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