Xamarin Forms Radio Button Data

I am currently in Xamarin Forms and I set a radio buttons to select a difficulty level and I am unsure how to actually send the selection to the main page. Code below has no attempt at sending data just currently where I am at. Advice greatly appreciated. Disclaimer obviously new to this.

XAML

            <RadioButton x:Name="Beginner" Content="Beginner"

             CheckedChanged="Active_List" />
            <RadioButton x:Name="Mid" Content="Mid Level"
             GroupName="DifficultySelection"
             CheckedChanged="Active_List"/>
            <RadioButton x:Name="Hard" Content="Hard"
             GroupName="DifficultySelection"
             CheckedChanged="Active_List"/>
            <RadioButton x:Name="Pro" Content="PRO"
             GroupName="DifficultySelection"
             CheckedChanged="Active_List"/>
            <RadioButton x:Name="Tricker" Content="Tricker"
             GroupName="DifficultySelection"
             CheckedChanged="Active_List"/>
            <Label x:Name="Decision" Padding="10,0,0,0"/>
            <Button Text="Back to Game" Clicked="BacktoMain" WidthRequest="20" HeightRequest="35" CornerRadius="20"  ></Button>
        </StackLayout>

C#

[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class TabbedPage1 : TabbedPage
{

    public TabbedPage1()
    {
        InitializeComponent();

    }


    //Command to Display Radio Button Decision on THIS PAGE
    void Active_List(object sender, EventArgs args)
    {
        RadioButton radioButton = sender as RadioButton;
        Decision.Text = $"Selected Difficulty: {radioButton.Content}";
    }


    //Command to Open Links
    private async void TapGestureRecognizer_Tapped(object sender, EventArgs e)
    {
        var url = (e as TappedEventArgs).Parameter as string;
        await Xamarin.Essentials.Launcher.OpenAsync(url);
    }

    //Button to Master List
    private async void List_Travel(object sender, EventArgs e)
    {


        await Navigation.PushModalAsync(new Master_List());

    }