This gist describes how to use the stacklayout in Xamarin Forms

StackLayout.cs

//This code was placed in the App.cs file
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Xamarin.Forms;
namespace App6
{
    public class App : Application
    {
        public App()
        {
            ////Alternately, you can do
            // public App()
            //{MainPage = StackLayoutz();}
            ////and then make a new function
            //public static Page StackLayoutz()
            //{   
            //    return new ContentPage()
            //    {
            //        Content = new StackLayout
            //        {
            //            Spacing = 0,
            //// and fill out the rest until the end

            MainPage = new ContentPage()
            {
                Content = new StackLayout
                {
                    Spacing = 0,
                    VerticalOptions = LayoutOptions.FillAndExpand,
                    Children =
                 {
                    new Label
                    {
                        Text = "StackLayout",
                        HorizontalOptions = LayoutOptions.Start
                    },
                    new Label
                    {
                        Text = "stacks its children",
                        HorizontalOptions = LayoutOptions.Center
                    },
                    new Label
                    {
                        Text = "vertically",
                        HorizontalOptions = LayoutOptions.End
                    },
                    new Label
                    {
                        Text = "by default,",
                        HorizontalOptions = LayoutOptions.Center
                    },
                    new Label
                    {
                        Text = "but horizontal placement",
                        HorizontalOptions = LayoutOptions.Start
                    },
                    new Label
                    {
                        Text = "can be controlled with",
                        HorizontalOptions = LayoutOptions.Center
                    },
                    new Label
                    {
                        Text = "the HorizontalOptions property.",
                        HorizontalOptions = LayoutOptions.End
                    },
                    new Label
                    {
                        Text = "An Expand option allows one or more children " +
                               "to occupy the an area within the remaining " +
                               "space of the StackLayout after it's been sized " +
                               "to the height of its parent.",
                        VerticalOptions = LayoutOptions.CenterAndExpand,
                        HorizontalOptions = LayoutOptions.End
                    },
                    new StackLayout
                    {
                        Spacing = 0,
                        Orientation = StackOrientation.Horizontal,
                        Children =
                        {
                            new Label
                            {
                                Text = "Stacking",
                            },
                            new Label
                            {
                                Text = "can also be",
                                HorizontalOptions = LayoutOptions.CenterAndExpand
                            },
                            new Label
                            {
                                Text = "horizontal.",
                            },
                        }
                    }
                }
                }
            };
            
        }
        
    }
}