diff --git a/PacticeSolution/PacticeSolution.sln b/PacticeSolution/PacticeSolution.sln
new file mode 100644
index 0000000..c55e02a
--- /dev/null
+++ b/PacticeSolution/PacticeSolution.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.33530.505
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PacticeSolution", "PacticeSolution\PacticeSolution.csproj", "{6AE700B8-28D0-4D9F-978B-91AFB1033125}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{6AE700B8-28D0-4D9F-978B-91AFB1033125}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6AE700B8-28D0-4D9F-978B-91AFB1033125}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6AE700B8-28D0-4D9F-978B-91AFB1033125}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6AE700B8-28D0-4D9F-978B-91AFB1033125}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {92FAC045-5C95-49EC-8241-6E62578C29E2}
+	EndGlobalSection
+EndGlobal
diff --git a/PacticeSolution/PacticeSolution/App.xaml b/PacticeSolution/PacticeSolution/App.xaml
new file mode 100644
index 0000000..003aef4
--- /dev/null
+++ b/PacticeSolution/PacticeSolution/App.xaml
@@ -0,0 +1,9 @@
+<Application x:Class="PacticeSolution.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:PacticeSolution"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>
diff --git a/PacticeSolution/PacticeSolution/App.xaml.cs b/PacticeSolution/PacticeSolution/App.xaml.cs
new file mode 100644
index 0000000..bd8af68
--- /dev/null
+++ b/PacticeSolution/PacticeSolution/App.xaml.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace PacticeSolution
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}
diff --git a/PacticeSolution/PacticeSolution/AssemblyInfo.cs b/PacticeSolution/PacticeSolution/AssemblyInfo.cs
new file mode 100644
index 0000000..8b5504e
--- /dev/null
+++ b/PacticeSolution/PacticeSolution/AssemblyInfo.cs
@@ -0,0 +1,10 @@
+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]
diff --git a/PacticeSolution/PacticeSolution/Children/ChildWindow.xaml b/PacticeSolution/PacticeSolution/Children/ChildWindow.xaml
new file mode 100644
index 0000000..e04ac3b
--- /dev/null
+++ b/PacticeSolution/PacticeSolution/Children/ChildWindow.xaml
@@ -0,0 +1,12 @@
+<Window x:Class="PacticeSolution.Children.ChildWindow"
+        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"
+        xmlns:local="clr-namespace:PacticeSolution.Children"
+        mc:Ignorable="d"
+        Title="ChildWindow" Height="100" Width="250" WindowStartupLocation="CenterOwner">
+    <Grid>
+        <Label FontFamily="Malgun Gothic" FontSize="30 " HorizontalAlignment="Center" VerticalAlignment="Center">Child window</Label>
+    </Grid>
+</Window>
diff --git a/PacticeSolution/PacticeSolution/Children/ChildWindow.xaml.cs b/PacticeSolution/PacticeSolution/Children/ChildWindow.xaml.cs
new file mode 100644
index 0000000..502c903
--- /dev/null
+++ b/PacticeSolution/PacticeSolution/Children/ChildWindow.xaml.cs
@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace PacticeSolution.Children
+{
+    /// <summary>
+    /// ChildWindow.xaml에 대한 상호 작용 논리
+    /// </summary>
+    public partial class ChildWindow : Window
+    {
+        public ChildWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}
diff --git a/PacticeSolution/PacticeSolution/MainWindow.xaml b/PacticeSolution/PacticeSolution/MainWindow.xaml
new file mode 100644
index 0000000..3995b09
--- /dev/null
+++ b/PacticeSolution/PacticeSolution/MainWindow.xaml
@@ -0,0 +1,15 @@
+<Window x:Class="PacticeSolution.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"
+        xmlns:local="clr-namespace:PacticeSolution"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="120" Width="400">
+    <StackPanel>
+        <Button x:Name="btnOwner" Click="btnOwner_Click">Owner</Button>
+        <Button x:Name="btnScreen" Click="btnScreen_Click">Screen</Button>
+        <Button x:Name="btnManual" Click="btnManual_Click">Manual</Button>
+        <Button x:Name="btnTopMost" Click="btnTopMost_Click">TopMost</Button>
+    </StackPanel>
+</Window>
diff --git a/PacticeSolution/PacticeSolution/MainWindow.xaml.cs b/PacticeSolution/PacticeSolution/MainWindow.xaml.cs
new file mode 100644
index 0000000..9fa2117
--- /dev/null
+++ b/PacticeSolution/PacticeSolution/MainWindow.xaml.cs
@@ -0,0 +1,59 @@
+using PacticeSolution.Children;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace PacticeSolution
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+
+        private void btnOwner_Click(object sender, RoutedEventArgs e)
+        {
+            ChildWindow child = new ChildWindow();
+            child.Owner = this;
+            child.WindowStartupLocation = WindowStartupLocation.CenterOwner;
+            child.Show();
+        }
+
+        private void btnScreen_Click(object sender, RoutedEventArgs e)
+        {
+            ChildWindow child = new ChildWindow();
+            child.WindowStartupLocation = WindowStartupLocation.CenterScreen;
+            child.Show();
+        }
+
+        private void btnManual_Click(object sender, RoutedEventArgs e)
+        {
+            ChildWindow child = new ChildWindow();
+            child.WindowStartupLocation = WindowStartupLocation.Manual;
+            child.Show();
+        }
+
+        private void btnTopMost_Click(object sender, RoutedEventArgs e)
+        {
+            ChildWindow child = new ChildWindow();
+            child.Background = Brushes.LightCyan;
+            child.Topmost = true;
+            child.Show();
+        }
+    }
+}
diff --git a/PacticeSolution/PacticeSolution/PacticeSolution.csproj b/PacticeSolution/PacticeSolution/PacticeSolution.csproj
new file mode 100644
index 0000000..4106cb0
--- /dev/null
+++ b/PacticeSolution/PacticeSolution/PacticeSolution.csproj
@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+</Project>