The easiest way to get writing your first XAML is to install Microsoft Visual Studio. This is avaliable free from Microsoft.

Once installed you can create a new project, of type WPF Application, either with a VB.NET or C# code.

This is similar to windows forms in the sense that you have a series of windows, the main difference being that these windows are written in XAML and are much more responsive to different devices.

Still needs improvment.

Here is a simple example of an XAML page in WPF. It consists of a Grid, a TextBlock and a Button - the most common elements in XAML.

<Window x:Class="FirstWpfApplication.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        Title="MainWindow" 
        Height="350"
        Width="525">
    <Grid>
        <TextBlock Text="Welcome to XAML!"
                   FontSize="30"
                   Foreground="Black"
                   HorizontalAlignment="Center"
                   VerticalAlignment="Center"/>
        
        <Button Content="Hello World!"
                Background="LightGray"
                Foreground="Black"
                FontSize="25"
                Margin="0,100,0,0"
                VerticalAlignment="Center"
                HorizontalAlignment="Center"/>
    </Grid>
</Window>

Syntax	Description
<Window>	The root container which hosts the content that visualizes data and enable users to interact with it. A WPF window is a combination of an XAML (.xaml) file, where the element is the root, and a CodeBehind (.cs) file.
<Grid>	A layout panel that arranges its child elements in a tabular structure of rows and columns.
<TextBlock>	Provides a lightweight control for displaying string text in its Text property or Inline flow content elements, such as Bold, Hyperlink, and InlineUIContainer, in its Inlines property.
<Button>	Represents a button control which reacts with the user click on it.

Property	Description
Title	Gets or sets the title of a window.
Height	Gets or sets the height of an element.
Width	Gets or sets the width of an element.
Text	Gets or sets the text content of a text element.
FontSize	Gets or sets the top-level font size for the text.
Background	Gets or sets the brush color that paints the background of an element.
Foreground	Gets or sets the brush color that paints the font of a text in an element.
Margin	Gets or sets the value that describes the outer space between an element and the others.
HorizontalAlignment	Gets or sets the horizontal alignment characteristics applied to the element when it is composed within a parent element, such as a panel or items control.
VerticalAlignment	Gets or sets the vertical alignment characteristics applied to the element when it is composed within a parent element such as a panel or items control.