Example of Grid Layout

grid.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d"
             x:Class="FormsAppTest.MainPage">

    <StackLayout>
        <!-- Note the use of ATTACHED PROPERTIES Grid.Row and Grid.Column -->
        <Label Text="Welcome to Xamarin.Forms" 
           HorizontalOptions="Center"
           VerticalOptions="CenterAndExpand" />
        <Grid Padding="10,10,10,10" VerticalOptions="CenterAndExpand">
           <Grid.RowDefinitions>
               <RowDefinition Height="2*"/>
               <RowDefinition Height="*"/>
               <RowDefinition Height="100"/>
           </Grid.RowDefinitions>
           <Grid.ColumnDefinitions>
               <ColumnDefinition Width="Auto"/>
               <ColumnDefinition Width="*"/>
           </Grid.ColumnDefinitions>
           
           <Label Text="Hello" Grid.Row="0" Grid.Column="0"
                  HorizontalOptions="FillAndExpand" HorizontalTextAlignment="Center"
                  VerticalOptions="FillAndExpand" VerticalTextAlignment="Center"
                  TextColor="White" BackgroundColor="Red"/>
            <Label Text="Welcome" Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2"
                   HorizontalOptions="FillAndExpand" HorizontalTextAlignment="Center"
                   VerticalTextAlignment="Center" VerticalOptions="FillAndExpand"
                   BackgroundColor="Green"/>
           <Label Text="World" Grid.Row="2" Grid.Column="1" 
                  HorizontalOptions="FillAndExpand" HorizontalTextAlignment="Center"
                  VerticalOptions="FillAndExpand" VerticalTextAlignment="Center"
                  TextColor="Yellow" BackgroundColor="Blue"/>

            <StackLayout Grid.Row="1" Grid.Column="0">
                <Button Text="Press"/>
                <Button Text="Me"/>
            </StackLayout>
        </Grid>
    </StackLayout>
</ContentPage>