Add project files.

VizhTalk.Learning.Domain/Entities/Course.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace VizhTalk.Learning.Domain.Entities
+{
+    internal class Course
+    {
+    }
+}

VizhTalk.Learning.Domain/Entities/Language.cs

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+using VizhTalk.BuildingBlocks.Domain;
+using VizhTalk.Learning.Domain.TypeIds;
+using VizhTalk.Learning.Domain.ValueObjects;
+
+namespace VizhTalk.Learning.Domain.Entities;
+
+public class Language : Entity<LanguageId>, IAggregateRoot
+{
+    public LanguageTitle Title { get; private set; }
+    
+}

VizhTalk.Learning.Domain/Entities/Learn.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace VizhTalk.Learning.Domain.Entities
+{
+    internal class Learn
+    {
+    }
+}

VizhTalk.Learning.Domain/Entities/Lesson.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace VizhTalk.Learning.Domain.Entities
+{
+    internal class Lesson
+    {
+    }
+}

VizhTalk.Learning.Domain/Entities/LessonType.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace VizhTalk.Learning.Domain.Entities
+{
+    internal class LessonType
+    {
+    }
+}

VizhTalk.Learning.Domain/Entities/Option.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace VizhTalk.Learning.Domain.Entities
+{
+    internal class Option
+    {
+    }
+}

VizhTalk.Learning.Domain/Entities/Section.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace VizhTalk.Learning.Domain.Entities
+{
+    internal class Section
+    {
+    }
+}

VizhTalk.Learning.Domain/Entities/Test.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace VizhTalk.Learning.Domain.Entities
+{
+    internal class Test
+    {
+    }
+}

VizhTalk.Learning.Domain/Entities/TestOption.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace VizhTalk.Learning.Domain.Entities
+{
+    internal class TestOption
+    {
+    }
+}

VizhTalk.Learning.Domain/Entities/Unit.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace VizhTalk.Learning.Domain.Entities
+{
+    internal class Unit
+    {
+    }
+}

VizhTalk.Learning.Domain/TypeIds/LanguageId.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using VizhTalk.BuildingBlocks.Domain;
+
+namespace VizhTalk.Learning.Domain.TypeIds
+{
+    public class LanguageId : TypedIdValueBase<LanguageId>
+    {
+        public LanguageId(LanguageId value) : base(value)
+        {
+        }
+    }
+}

VizhTalk.Learning.Domain/ValueObjects/LanguageTitle.cs

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+using VizhTalk.BuildingBlocks.Domain;
+using VizhTalk.BuildingBlocks.Domain.Guards;
+
+namespace VizhTalk.Learning.Domain.ValueObjects
+{
+    public class LanguageTitle : ValueObject
+    {
+        public LanguageTitle(string title)
+        {
+            Guard.NullOrEmpty(title, nameof(LanguageTitle));
+            Value = title;
+        }
+        public string Value { get; set; }
+    }
+}

VizhTalk.Learning.Domain/VizhTalk.Learning.Domain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Events\" />
+    <Folder Include="Exceptions\" />
+    <Folder Include="Rules\" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\VizhTalk.BuildingBlocks.Domain\VizhTalk.BuildingBlocks.Domain.csproj" />
+  </ItemGroup>
+
+</Project>