diff --git a/API_SQLuedo/EntityFramework/SQLudeoDB/BlackListEntity.cs b/API_SQLuedo/EntityFramework/SQLuedoDB/BlackListEntity.cs
similarity index 94%
rename from API_SQLuedo/EntityFramework/SQLudeoDB/BlackListEntity.cs
rename to API_SQLuedo/EntityFramework/SQLuedoDB/BlackListEntity.cs
index 0bd485b..a1cb718 100644
--- a/API_SQLuedo/EntityFramework/SQLudeoDB/BlackListEntity.cs
+++ b/API_SQLuedo/EntityFramework/SQLuedoDB/BlackListEntity.cs
@@ -5,7 +5,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace Entities.SQLudeoDB
+namespace Entities.SQLuedoDB
 {
     public class BlackListEntity
     {
diff --git a/API_SQLuedo/EntityFramework/SQLudeoDB/ContentLessonEntity.cs b/API_SQLuedo/EntityFramework/SQLuedoDB/ContentLessonEntity.cs
similarity index 90%
rename from API_SQLuedo/EntityFramework/SQLudeoDB/ContentLessonEntity.cs
rename to API_SQLuedo/EntityFramework/SQLuedoDB/ContentLessonEntity.cs
index f701557..d352c7b 100644
--- a/API_SQLuedo/EntityFramework/SQLudeoDB/ContentLessonEntity.cs
+++ b/API_SQLuedo/EntityFramework/SQLuedoDB/ContentLessonEntity.cs
@@ -5,8 +5,9 @@ using System.ComponentModel.DataAnnotations.Schema;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using Entities.SQLuedoDB;
 
-namespace Entities.SQLudeoDB
+namespace Entities.SQLuedoDB
 {
     public class ContentLessonEntity
     {
diff --git a/API_SQLuedo/EntityFramework/SQLudeoDB/InquiryEntity.cs b/API_SQLuedo/EntityFramework/SQLuedoDB/InquiryEntity.cs
similarity index 97%
rename from API_SQLuedo/EntityFramework/SQLudeoDB/InquiryEntity.cs
rename to API_SQLuedo/EntityFramework/SQLuedoDB/InquiryEntity.cs
index 48b9edd..ed15696 100644
--- a/API_SQLuedo/EntityFramework/SQLudeoDB/InquiryEntity.cs
+++ b/API_SQLuedo/EntityFramework/SQLuedoDB/InquiryEntity.cs
@@ -4,7 +4,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace Entities.SQLudeoDB
+namespace Entities.SQLuedoDB
 {
     public class InquiryEntity
     {
diff --git a/API_SQLuedo/EntityFramework/SQLudeoDB/InquiryTableEntity.cs b/API_SQLuedo/EntityFramework/SQLuedoDB/InquiryTableEntity.cs
similarity index 97%
rename from API_SQLuedo/EntityFramework/SQLudeoDB/InquiryTableEntity.cs
rename to API_SQLuedo/EntityFramework/SQLuedoDB/InquiryTableEntity.cs
index 6236273..d9ee75f 100644
--- a/API_SQLuedo/EntityFramework/SQLudeoDB/InquiryTableEntity.cs
+++ b/API_SQLuedo/EntityFramework/SQLuedoDB/InquiryTableEntity.cs
@@ -1,7 +1,7 @@
 using System.ComponentModel.DataAnnotations.Schema;
 using System.ComponentModel.DataAnnotations;
 
-namespace Entities.SQLudeoDB
+namespace Entities.SQLuedoDB
 {
     public class InquiryTableEntity
     {
diff --git a/API_SQLuedo/EntityFramework/SQLudeoDB/LessonEntity.cs b/API_SQLuedo/EntityFramework/SQLuedoDB/LessonEntity.cs
similarity index 96%
rename from API_SQLuedo/EntityFramework/SQLudeoDB/LessonEntity.cs
rename to API_SQLuedo/EntityFramework/SQLuedoDB/LessonEntity.cs
index bd869f3..1f3bff3 100644
--- a/API_SQLuedo/EntityFramework/SQLudeoDB/LessonEntity.cs
+++ b/API_SQLuedo/EntityFramework/SQLuedoDB/LessonEntity.cs
@@ -4,7 +4,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace Entities.SQLudeoDB
+namespace Entities.SQLuedoDB
 {
     public class LessonEntity
     {
diff --git a/API_SQLuedo/EntityFramework/SQLudeoDB/NotepadEntity.cs b/API_SQLuedo/EntityFramework/SQLuedoDB/NotepadEntity.cs
similarity index 97%
rename from API_SQLuedo/EntityFramework/SQLudeoDB/NotepadEntity.cs
rename to API_SQLuedo/EntityFramework/SQLuedoDB/NotepadEntity.cs
index a68e91d..f20c498 100644
--- a/API_SQLuedo/EntityFramework/SQLudeoDB/NotepadEntity.cs
+++ b/API_SQLuedo/EntityFramework/SQLuedoDB/NotepadEntity.cs
@@ -5,7 +5,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace Entities.SQLudeoDB
+namespace Entities.SQLuedoDB
 {
     public class NotepadEntity
     {
diff --git a/API_SQLuedo/EntityFramework/SQLudeoDB/ParagraphEntity.cs b/API_SQLuedo/EntityFramework/SQLuedoDB/ParagraphEntity.cs
similarity index 96%
rename from API_SQLuedo/EntityFramework/SQLudeoDB/ParagraphEntity.cs
rename to API_SQLuedo/EntityFramework/SQLuedoDB/ParagraphEntity.cs
index aefcc9d..996dc88 100644
--- a/API_SQLuedo/EntityFramework/SQLudeoDB/ParagraphEntity.cs
+++ b/API_SQLuedo/EntityFramework/SQLuedoDB/ParagraphEntity.cs
@@ -1,4 +1,4 @@
-namespace Entities.SQLudeoDB
+namespace Entities.SQLuedoDB
 {
     public class ParagraphEntity
     {
diff --git a/API_SQLuedo/EntityFramework/SQLudeoDB/SolutionEntity.cs b/API_SQLuedo/EntityFramework/SQLuedoDB/SolutionEntity.cs
similarity index 98%
rename from API_SQLuedo/EntityFramework/SQLudeoDB/SolutionEntity.cs
rename to API_SQLuedo/EntityFramework/SQLuedoDB/SolutionEntity.cs
index db727a0..f7df58e 100644
--- a/API_SQLuedo/EntityFramework/SQLudeoDB/SolutionEntity.cs
+++ b/API_SQLuedo/EntityFramework/SQLuedoDB/SolutionEntity.cs
@@ -2,7 +2,7 @@
 using System.ComponentModel.DataAnnotations;
 using System.Security.Cryptography.X509Certificates;
 
-namespace Entities.SQLudeoDB
+namespace Entities.SQLuedoDB
 {
     public class SolutionEntity
     {
diff --git a/API_SQLuedo/EntityFramework/SQLudeoDB/SuccessEntity.cs b/API_SQLuedo/EntityFramework/SQLuedoDB/SuccessEntity.cs
similarity index 97%
rename from API_SQLuedo/EntityFramework/SQLudeoDB/SuccessEntity.cs
rename to API_SQLuedo/EntityFramework/SQLuedoDB/SuccessEntity.cs
index 780fdd4..498286a 100644
--- a/API_SQLuedo/EntityFramework/SQLudeoDB/SuccessEntity.cs
+++ b/API_SQLuedo/EntityFramework/SQLuedoDB/SuccessEntity.cs
@@ -6,7 +6,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace Entities.SQLudeoDB
+namespace Entities.SQLuedoDB
 {
     public class SuccessEntity
     {
diff --git a/API_SQLuedo/EntityFramework/SQLudeoDB/UserEntity.cs b/API_SQLuedo/EntityFramework/SQLuedoDB/UserEntity.cs
similarity index 96%
rename from API_SQLuedo/EntityFramework/SQLudeoDB/UserEntity.cs
rename to API_SQLuedo/EntityFramework/SQLuedoDB/UserEntity.cs
index 4829445..82f168b 100644
--- a/API_SQLuedo/EntityFramework/SQLudeoDB/UserEntity.cs
+++ b/API_SQLuedo/EntityFramework/SQLuedoDB/UserEntity.cs
@@ -1,6 +1,6 @@
 using System.ComponentModel.DataAnnotations.Schema;
 
-namespace Entities.SQLudeoDB
+namespace Entities.SQLuedoDB
 {
     [Table("user")]
     public class UserEntity
diff --git a/API_SQLuedo/Model/Business/BlackList.cs b/API_SQLuedo/Model/Business/BlackList.cs
new file mode 100644
index 0000000..b7fb84b
--- /dev/null
+++ b/API_SQLuedo/Model/Business/BlackList.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Model.Business
+{
+    public class BlackList
+    {
+        public string Email { get; set; }
+        public DateOnly ExpirationDate { get; set; }
+
+        public BlackList(string email, DateOnly expirationDate)
+        {
+            Email = email;
+            ExpirationDate = expirationDate;
+        }
+    }
+}
diff --git a/API_SQLuedo/Model/Business/Lesson.cs b/API_SQLuedo/Model/Business/Lesson.cs
new file mode 100644
index 0000000..de2d9a0
--- /dev/null
+++ b/API_SQLuedo/Model/Business/Lesson.cs
@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Model.Business
+{
+    public class Lesson
+    {
+        public int Id { get; }
+        public string Title { get; set; }
+        public string LastPublisher { get; set; }
+        public DateOnly LastEdit { get; set; }
+
+        public Lesson() { }
+        public Lesson(int id, string title, string lastPublisher, DateOnly lastEdit)
+        {
+            Id = id;
+            Title = title;
+            LastPublisher = lastPublisher;
+            LastEdit = lastEdit;
+        }
+
+        public Lesson(string title, string lastPublisher, DateOnly lastEdit)
+        {
+            Title = title;
+            LastPublisher = lastPublisher;
+            LastEdit = lastEdit;
+        }
+    }
+}
diff --git a/API_SQLuedo/Model/Business/Paragraph.cs b/API_SQLuedo/Model/Business/Paragraph.cs
new file mode 100644
index 0000000..f33b5bc
--- /dev/null
+++ b/API_SQLuedo/Model/Business/Paragraph.cs
@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Model.Business
+{
+    public class Paragraph
+    {
+        public int Id { get;  }
+        public string Title { get; set; }
+        public string Content { get; set; }
+        public string Info { get; set; }
+        public string Query { get; set; }
+        public string Comment { get; set; }
+
+        public Paragraph() { }
+
+        public Paragraph(int id, string title, string content, string info, string query, string comment)
+        {
+            Id = id;
+            Title = title;
+            Content = content;
+            Info = info;
+            Query = query;
+            Comment = comment;
+        }
+        public Paragraph(string title, string content, string info, string query, string comment)
+        {
+            Title = title;
+            Content = content;
+            Info = info;
+            Query = query;
+            Comment = comment;
+        }
+    }
+}
diff --git a/API_SQLuedo/Model/DTO/BlackListDTO.cs b/API_SQLuedo/Model/DTO/BlackListDTO.cs
new file mode 100644
index 0000000..2ecfcaf
--- /dev/null
+++ b/API_SQLuedo/Model/DTO/BlackListDTO.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Model.DTO
+{
+    public class BlackListDTO
+    {
+        public string Email { get; set; }
+        public DateOnly ExpirationDate { get; set; }
+
+        public BlackListDTO(string email, DateOnly expirationDate)
+        {
+            Email = email;
+            ExpirationDate = expirationDate;
+        }
+    }
+}
diff --git a/API_SQLuedo/Model/DTO/LessonDTO.cs b/API_SQLuedo/Model/DTO/LessonDTO.cs
new file mode 100644
index 0000000..dfc3351
--- /dev/null
+++ b/API_SQLuedo/Model/DTO/LessonDTO.cs
@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Model.DTO
+{
+    public class LessonDTO
+    {
+        public int Id { get; }
+        public string Title { get; set; }
+        public string LastPublisher { get; set; }
+        public DateOnly LastEdit { get; set; }
+
+        public LessonDTO() { }
+        public LessonDTO(int id, string title, string lastPublisher, DateOnly lastEdit)
+        {
+            Id = id;
+            Title = title;
+            LastPublisher = lastPublisher;
+            LastEdit = lastEdit;
+        }
+
+        public LessonDTO(string title, string lastPublisher, DateOnly lastEdit)
+        {
+            Title = title;
+            LastPublisher = lastPublisher;
+            LastEdit = lastEdit;
+        }
+    }
+}
diff --git a/API_SQLuedo/Model/DTO/ParagraphDTO.cs b/API_SQLuedo/Model/DTO/ParagraphDTO.cs
new file mode 100644
index 0000000..e6a3442
--- /dev/null
+++ b/API_SQLuedo/Model/DTO/ParagraphDTO.cs
@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Model.DTO
+{
+    public class ParagraphDTO
+    {
+        public int Id { get; }
+        public string Title { get; set; }
+        public string Content { get; set; }
+        public string Info { get; set; }
+        public string Query { get; set; }
+        public string Comment { get; set; }
+
+        public ParagraphDTO() { }
+
+        public ParagraphDTO(int id, string title, string content, string info, string query, string comment)
+        {
+            Id = id;
+            Title = title;
+            Content = content;
+            Info = info;
+            Query = query;
+            Comment = comment;
+        }
+        public ParagraphDTO(string title, string content, string info, string query, string comment)
+        {
+            Title = title;
+            Content = content;
+            Info = info;
+            Query = query;
+            Comment = comment;
+        }
+    }
+}
diff --git a/API_SQLuedo/Model/Mappers/BlackListMapper.cs b/API_SQLuedo/Model/Mappers/BlackListMapper.cs
new file mode 100644
index 0000000..dc9a5fa
--- /dev/null
+++ b/API_SQLuedo/Model/Mappers/BlackListMapper.cs
@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Entities.SQLudeoDB;
+using Model.Business;
+using Model.DTO;
+
+namespace Model.Mappers
+{
+    public class BlackListMapper
+    {
+        public static BlackListDTO FromModelToDTO(BlackList model)
+        {
+            return new BlackListDTO(model.Email, model.ExpirationDate);
+        }
+
+        public static BlackListDTO FromEntityToDTO(BlackListEntity ent)
+        {
+            return new BlackListDTO(ent.Email, ent.ExpirationDate);
+        }
+
+        public static BlackList FromDTOToModel(BlackListDTO dto)
+        {
+            return new BlackList(dto.Email, dto.ExpirationDate);
+        }
+
+        public static BlackList FromEntityToModel(BlackListEntity ent)
+        {
+            return new BlackList(ent.Email, ent.ExpirationDate);
+        }
+
+        public static BlackListEntity FromDTOToEntity(BlackListDTO dto)
+        {
+            return new BlackListEntity(dto.Email, dto.ExpirationDate);
+        }
+
+        public static BlackListEntity FromModelToEntity(BlackList model)
+        {
+            return new BlackListEntity(model.Email, model.ExpirationDate);
+        }
+    }
+}
diff --git a/API_SQLuedo/Model/Mappers/LessonMapper.cs b/API_SQLuedo/Model/Mappers/LessonMapper.cs
new file mode 100644
index 0000000..2463006
--- /dev/null
+++ b/API_SQLuedo/Model/Mappers/LessonMapper.cs
@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Entities.SQLudeoDB;
+using Model.Business;
+using Model.DTO;
+
+namespace Model.Mappers
+{
+    public class LessonMapper
+    {
+
+        public static LessonDTO FromModelToDTO(Lesson model)
+        {
+            return new LessonDTO(model.Id, model.Title, model.LastPublisher, model.LastEdit);
+        }
+
+        public static LessonDTO FromEntityToDTO(LessonEntity model)
+        {
+            return new LessonDTO(model.Id, model.Title, model.LastPublisher, model.LastEdit);
+        }
+
+        public static LessonEntity FromModelToEntity(Lesson model)
+        {
+            return new LessonEntity(model.Id, model.Title, model.LastPublisher, model.LastEdit);
+        }
+
+        public static LessonEntity FromDTOToEntity(LessonDTO dto)
+        {
+            return new LessonEntity(dto.Id, dto.Title, dto.LastPublisher, dto.LastEdit);
+        }
+
+        public static Lesson FromDTOToModel(LessonDTO dto)
+        {
+            return new Lesson(dto.Id, dto.Title, dto.LastPublisher, dto.LastEdit);
+        }
+
+        public static Lesson FromEntityToModel(LessonEntity entity)
+        {
+            return new Lesson(entity.Id, entity.Title, entity.LastPublisher, entity.LastEdit);
+        }
+    }
+}
diff --git a/API_SQLuedo/Model/Mappers/ParagraphMapper.cs b/API_SQLuedo/Model/Mappers/ParagraphMapper.cs
new file mode 100644
index 0000000..722184c
--- /dev/null
+++ b/API_SQLuedo/Model/Mappers/ParagraphMapper.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Model.Mappers
+{
+    internal class ParagraphMapper
+    {
+    }
+}