diff --git a/NG_2023_Kanban.BusinessLayer/Service/Injecting.cs b/NG_2023_Kanban.BusinessLayer/Injecting.cs
similarity index 71%
rename from NG_2023_Kanban.BusinessLayer/Service/Injecting.cs
rename to NG_2023_Kanban.BusinessLayer/Injecting.cs
index f74800f..daa2e30 100644
--- a/NG_2023_Kanban.BusinessLayer/Service/Injecting.cs
+++ b/NG_2023_Kanban.BusinessLayer/Injecting.cs
@@ -1,4 +1,4 @@
-using NG_2023_Kanban.BusinessLayer.Service;
+using NG_2023_Kanban.BusinessLayer.Services;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace NG_2023_Kanban.BusinessLayer.Inject
@@ -8,7 +8,7 @@ namespace NG_2023_Kanban.BusinessLayer.Inject
         public static void InjectBLL(
             this IServiceCollection services)
         {
-            services.AddScoped<BusinessService>();
+            services.AddScoped<UserService>();
         }
     }
 }
diff --git a/NG_2023_Kanban.BusinessLayer/Interfaces/IUserService.cs b/NG_2023_Kanban.BusinessLayer/Interfaces/IUserService.cs
new file mode 100644
index 0000000..f40c43e
--- /dev/null
+++ b/NG_2023_Kanban.BusinessLayer/Interfaces/IUserService.cs
@@ -0,0 +1,10 @@
+using NG_2023_Kanban.DataLayer.Entities;
+
+namespace NG_2023_Kanban.BusinessLayer.Interfaces
+{
+    public interface IUserService
+    {
+        Task<User> LoginAsync(User user);
+        Task<User> RegisterAsync(User user);
+    }
+}
diff --git a/NG_2023_Kanban.BusinessLayer/Service/BusinessService.cs b/NG_2023_Kanban.BusinessLayer/Service/BusinessService.cs
deleted file mode 100644
index 9ee0223..0000000
--- a/NG_2023_Kanban.BusinessLayer/Service/BusinessService.cs
+++ /dev/null
@@ -1,33 +0,0 @@
-using NG_2023_Kanban.DataLayer.Service;
-using NG_2023_Kanban.DataLayer.Entities;
-using Microsoft.EntityFrameworkCore;
-
-namespace NG_2023_Kanban.BusinessLayer.Service
-{
-    public class BusinessService
-    {
-        private readonly DataService _service;
-        public BusinessService(DataService service) 
-        {
-            _service = service;
-        }
-
-        public async Task<User> LoginAsync(string username, string password)
-        {
-            return await _service.LoginAsync(username, password);
-        }
-
-        public async Task<User> RegisterAsync(string fullName, string username, string password)
-        {
-            User account = await _service.AddAsync(new User
-            {
-                FullName = fullName,
-                Username = username,
-                Password = password, // TODO: hashing
-                IsAdmin = false
-            });
-
-            return account;
-        }
-    }
-}
diff --git a/NG_2023_Kanban.BusinessLayer/Service/UserService.cs b/NG_2023_Kanban.BusinessLayer/Service/UserService.cs
new file mode 100644
index 0000000..d544b8c
--- /dev/null
+++ b/NG_2023_Kanban.BusinessLayer/Service/UserService.cs
@@ -0,0 +1,33 @@
+using NG_2023_Kanban.BusinessLayer.Interfaces;
+using NG_2023_Kanban.DataLayer.Repositories;
+using NG_2023_Kanban.DataLayer.Entities;
+using NG_2023_Kanban.DataLayer.Interfaces;
+using Microsoft.EntityFrameworkCore;
+
+namespace NG_2023_Kanban.BusinessLayer.Services
+{
+    public class UserService : IUserService
+    {
+        private readonly IUserRepository _userRepository;
+
+        public UserService(IUserRepository userRepository)
+        {
+            _userRepository = userRepository;
+        }
+
+        public async Task<User?> LoginAsync(User user)
+        {
+            var data = await _userRepository.FindAsync(x => x.Username == user.Username && x.Password == user.Password);
+            if (data.Any())
+                return data.First();
+            else
+                return null;
+        }
+
+        public async Task<User> RegisterAsync(User user)
+        {
+            await _userRepository.CreateAsync(user);
+            return user;
+        }
+    }
+}
diff --git a/NG_2023_Kanban.DataLayer/DbStartup/DatabaseContext.cs b/NG_2023_Kanban.DataLayer/DbStartup/DatabaseContext.cs
index 2739ea7..7886c58 100644
--- a/NG_2023_Kanban.DataLayer/DbStartup/DatabaseContext.cs
+++ b/NG_2023_Kanban.DataLayer/DbStartup/DatabaseContext.cs
@@ -6,18 +6,20 @@ namespace NG_2023_Kanban.DataLayer.DbStartup
 {
     public class DatabaseContext : DbContext
     {
-        public DatabaseContext(DbContextOptions<DatabaseContext> options) : base(options) { }
+        public DatabaseContext(DbContextOptions options) : base(options) { }
 
         public DbSet<Board> Boards { get; set; }
-        public DbSet<Comment> Comments { get; set; }
         public DbSet<Card> Cards { get; set; }
+        public DbSet<Column> Columns { get; set; }
+        public DbSet<Comment> Comments { get; set; }
         public DbSet<User> Users { get; set; }
 
         protected override void OnModelCreating(ModelBuilder modelBuilder)
         {
             modelBuilder.ApplyConfiguration(new BoardConfiguration());
-            modelBuilder.ApplyConfiguration(new CommentConfiguration());
             modelBuilder.ApplyConfiguration(new CardConfiguration());
+            modelBuilder.ApplyConfiguration(new ColumnConfiguration());
+            modelBuilder.ApplyConfiguration(new CommentConfiguration());
             modelBuilder.ApplyConfiguration(new UserConfiguration());
 
             base.OnModelCreating(modelBuilder);
diff --git a/NG_2023_Kanban.DataLayer/DbStartup/Injecting.cs b/NG_2023_Kanban.DataLayer/DbStartup/Injecting.cs
index 1c3d8fc..78e2469 100644
--- a/NG_2023_Kanban.DataLayer/DbStartup/Injecting.cs
+++ b/NG_2023_Kanban.DataLayer/DbStartup/Injecting.cs
@@ -1,4 +1,6 @@
 using NG_2023_Kanban.DataLayer.Service;
+using NG_2023_Kanban.DataLayer.Repositories;
+using NG_2023_Kanban.DataLayer.Interfaces;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
@@ -11,12 +13,23 @@ namespace NG_2023_Kanban.DataLayer.DbStartup
             this IServiceCollection services,
             IConfiguration configuration)
         {
+            services.AddTransient<IBoardRepository, BoardRepository>();
+            services.AddTransient<ICardRepository, CardRepository>();
+            services.AddTransient<IColumnRepository, ColumnRepository>();
+            services.AddTransient<ICommentRepository, CommentRepository>();
+            services.AddTransient<IUserRepository, UserRepository>();
+
+            var optionsBuilder = new DbContextOptionsBuilder<DatabaseContext>();
+
+            optionsBuilder.UseSqlServer(configuration["ConnectionString"]);
+
             services.AddDbContext<DatabaseContext>(options =>
             {
                 options.UseSqlServer(
                     configuration["ConnectionString"]);
             });
-            services.AddScoped<DataService>();
+
+            (new DatabaseContext(optionsBuilder.Options)).Database.EnsureCreated(); // possibly misplaced
         }
     }
 }
diff --git a/NG_2023_Kanban.DataLayer/Entities/User.cs b/NG_2023_Kanban.DataLayer/Entities/User.cs
index 8bd8cf7..b9aaf90 100644
--- a/NG_2023_Kanban.DataLayer/Entities/User.cs
+++ b/NG_2023_Kanban.DataLayer/Entities/User.cs
@@ -7,7 +7,7 @@
         public string Username { get; set; }
         public string Password { get; set; }
 
-        public bool IsAdmin { get; set; }
+        public bool IsAdmin { get; set; } = false;
 
         public virtual ICollection<Board>? Boards { get; set; } = new HashSet<Board>();
         public virtual ICollection<Card>? Cards { get; set; } = new HashSet<Card>();
diff --git a/NG_2023_Kanban.DataLayer/EntityConfiguration/ColumnConfiguration.cs b/NG_2023_Kanban.DataLayer/EntityConfiguration/ColumnConfiguration.cs
index a964ce6..7294c78 100644
--- a/NG_2023_Kanban.DataLayer/EntityConfiguration/ColumnConfiguration.cs
+++ b/NG_2023_Kanban.DataLayer/EntityConfiguration/ColumnConfiguration.cs
@@ -14,9 +14,6 @@ namespace NG_2023_Kanban.DataLayer.EntityConfiguration
             builder.Property(x => x.Name).IsRequired();
             builder.Property(x => x.Name).HasMaxLength(100);
 
-            builder.Property(x => x.Board).IsRequired();
-            builder.Property(x => x.Board).HasMaxLength(100);
-
             builder
                 .HasOne(x => x.Board)
                 .WithMany(x => x.Columns)
diff --git a/NG_2023_Kanban.DataLayer/Interfaces/IBoardRepository.cs b/NG_2023_Kanban.DataLayer/Interfaces/IBoardRepository.cs
new file mode 100644
index 0000000..ecb6ee4
--- /dev/null
+++ b/NG_2023_Kanban.DataLayer/Interfaces/IBoardRepository.cs
@@ -0,0 +1,8 @@
+using NG_2023_Kanban.DataLayer.Entities;
+
+namespace NG_2023_Kanban.DataLayer.Interfaces
+{
+    public interface IBoardRepository : IRepository<Board>
+    {
+    }
+}
diff --git a/NG_2023_Kanban.DataLayer/Interfaces/ICardRepository.cs b/NG_2023_Kanban.DataLayer/Interfaces/ICardRepository.cs
new file mode 100644
index 0000000..9ec467b
--- /dev/null
+++ b/NG_2023_Kanban.DataLayer/Interfaces/ICardRepository.cs
@@ -0,0 +1,8 @@
+using NG_2023_Kanban.DataLayer.Entities;
+
+namespace NG_2023_Kanban.DataLayer.Interfaces
+{
+    public interface ICardRepository : IRepository<Card>
+    {
+    }
+}
diff --git a/NG_2023_Kanban.DataLayer/Interfaces/IColumnRepository.cs b/NG_2023_Kanban.DataLayer/Interfaces/IColumnRepository.cs
new file mode 100644
index 0000000..0762298
--- /dev/null
+++ b/NG_2023_Kanban.DataLayer/Interfaces/IColumnRepository.cs
@@ -0,0 +1,8 @@
+using NG_2023_Kanban.DataLayer.Entities;
+
+namespace NG_2023_Kanban.DataLayer.Interfaces
+{
+    public interface IColumnRepository : IRepository<Column>
+    {
+    }
+}
diff --git a/NG_2023_Kanban.DataLayer/Interfaces/ICommentRepository.cs b/NG_2023_Kanban.DataLayer/Interfaces/ICommentRepository.cs
new file mode 100644
index 0000000..db59bb6
--- /dev/null
+++ b/NG_2023_Kanban.DataLayer/Interfaces/ICommentRepository.cs
@@ -0,0 +1,8 @@
+using NG_2023_Kanban.DataLayer.Entities;
+
+namespace NG_2023_Kanban.DataLayer.Interfaces
+{
+    public interface ICommentRepository : IRepository<Comment>
+    {
+    }
+}
diff --git a/NG_2023_Kanban.DataLayer/Interfaces/IRepository.cs b/NG_2023_Kanban.DataLayer/Interfaces/IRepository.cs
new file mode 100644
index 0000000..281f955
--- /dev/null
+++ b/NG_2023_Kanban.DataLayer/Interfaces/IRepository.cs
@@ -0,0 +1,13 @@
+namespace NG_2023_Kanban.DataLayer.Interfaces
+{
+    public interface IRepository<T> where T : class
+    {
+        Task<ICollection<T>> GetAllAsync();
+        Task<T> GetAsync(int id);
+        Task<ICollection<T>> FindAsync(Func<T, Boolean> predicate);
+        Task CreateAsync(T entity);
+        Task UpdateAsync(T entity);
+        Task DeleteAsync(int id);
+        Task DeleteAsync(T entity);
+    }
+}
diff --git a/NG_2023_Kanban.DataLayer/Interfaces/IUserRepository.cs b/NG_2023_Kanban.DataLayer/Interfaces/IUserRepository.cs
new file mode 100644
index 0000000..8ba267e
--- /dev/null
+++ b/NG_2023_Kanban.DataLayer/Interfaces/IUserRepository.cs
@@ -0,0 +1,8 @@
+using NG_2023_Kanban.DataLayer.Entities;
+
+namespace NG_2023_Kanban.DataLayer.Interfaces
+{
+    public interface IUserRepository : IRepository<User>
+    {
+    }
+}
diff --git a/NG_2023_Kanban.DataLayer/Repositories/BaseRepository.cs b/NG_2023_Kanban.DataLayer/Repositories/BaseRepository.cs
new file mode 100644
index 0000000..f0502ae
--- /dev/null
+++ b/NG_2023_Kanban.DataLayer/Repositories/BaseRepository.cs
@@ -0,0 +1,50 @@
+using NG_2023_Kanban.DataLayer.DbStartup;
+using NG_2023_Kanban.DataLayer.Entities;
+using NG_2023_Kanban.DataLayer.Interfaces;
+using Microsoft.EntityFrameworkCore;
+
+namespace NG_2023_Kanban.DataLayer.Repositories;
+
+public class BaseRepository<T> : IRepository<T> where T : BaseEntity
+{
+    private DatabaseContext _context;
+
+    public BaseRepository(DatabaseContext context)
+        => _context = context;
+
+    public async Task<ICollection<T>> GetAllAsync()
+        => await _context.Set<T>().Select(x => x).ToListAsync();
+
+    public async Task<T> GetAsync(int id)
+        => await _context.Set<T>().FirstAsync(x => x.Id == id);
+
+    public async Task<ICollection<T>> FindAsync(Func<T, bool> predicate)
+    {
+        var entities = await GetAllAsync();
+        return entities.Where(predicate).ToList();
+    }
+
+    public async Task CreateAsync(T entity)
+    {
+        await _context.Set<T>().AddAsync(entity);
+        await _context.SaveChangesAsync();
+    }
+
+    public async Task UpdateAsync(T entity)
+    {
+        _context.Set<T>().Update(entity);
+        await _context.SaveChangesAsync();
+    }
+
+    public async Task DeleteAsync(int id)
+    {
+        var entity = await GetAsync(id);
+        await DeleteAsync(entity);
+    }
+
+    public async Task DeleteAsync(T entity)
+    {
+        _context.Set<T>().Remove(entity);
+        await _context.SaveChangesAsync();
+    }
+}
diff --git a/NG_2023_Kanban.DataLayer/Repositories/BoardRepository.cs b/NG_2023_Kanban.DataLayer/Repositories/BoardRepository.cs
new file mode 100644
index 0000000..c32bea0
--- /dev/null
+++ b/NG_2023_Kanban.DataLayer/Repositories/BoardRepository.cs
@@ -0,0 +1,10 @@
+using NG_2023_Kanban.DataLayer.DbStartup;
+using NG_2023_Kanban.DataLayer.Entities;
+using NG_2023_Kanban.DataLayer.Interfaces;
+
+namespace NG_2023_Kanban.DataLayer.Repositories;
+
+public class BoardRepository : BaseRepository<Board>, IBoardRepository
+{
+    public BoardRepository(DatabaseContext context) : base(context) { }
+}
diff --git a/NG_2023_Kanban.DataLayer/Repositories/CardRepository.cs b/NG_2023_Kanban.DataLayer/Repositories/CardRepository.cs
new file mode 100644
index 0000000..9011ad0
--- /dev/null
+++ b/NG_2023_Kanban.DataLayer/Repositories/CardRepository.cs
@@ -0,0 +1,10 @@
+using NG_2023_Kanban.DataLayer.DbStartup;
+using NG_2023_Kanban.DataLayer.Entities;
+using NG_2023_Kanban.DataLayer.Interfaces;
+
+namespace NG_2023_Kanban.DataLayer.Repositories;
+
+public class CardRepository : BaseRepository<Card>, ICardRepository
+{
+    public CardRepository(DatabaseContext context) : base(context) { }
+}
diff --git a/NG_2023_Kanban.DataLayer/Repositories/ColumnRepository.cs b/NG_2023_Kanban.DataLayer/Repositories/ColumnRepository.cs
new file mode 100644
index 0000000..249ed05
--- /dev/null
+++ b/NG_2023_Kanban.DataLayer/Repositories/ColumnRepository.cs
@@ -0,0 +1,10 @@
+using NG_2023_Kanban.DataLayer.DbStartup;
+using NG_2023_Kanban.DataLayer.Entities;
+using NG_2023_Kanban.DataLayer.Interfaces;
+
+namespace NG_2023_Kanban.DataLayer.Repositories;
+
+public class ColumnRepository : BaseRepository<Column>, IColumnRepository
+{
+    public ColumnRepository(DatabaseContext context) : base(context) { }
+}
diff --git a/NG_2023_Kanban.DataLayer/Repositories/CommentRepository.cs b/NG_2023_Kanban.DataLayer/Repositories/CommentRepository.cs
new file mode 100644
index 0000000..2ae2f90
--- /dev/null
+++ b/NG_2023_Kanban.DataLayer/Repositories/CommentRepository.cs
@@ -0,0 +1,10 @@
+using NG_2023_Kanban.DataLayer.DbStartup;
+using NG_2023_Kanban.DataLayer.Entities;
+using NG_2023_Kanban.DataLayer.Interfaces;
+
+namespace NG_2023_Kanban.DataLayer.Repositories;
+
+public class CommentRepository : BaseRepository<Comment>, ICommentRepository
+{
+    public CommentRepository(DatabaseContext context) : base(context) { }
+}
diff --git a/NG_2023_Kanban.DataLayer/Repositories/UserRepository.cs b/NG_2023_Kanban.DataLayer/Repositories/UserRepository.cs
new file mode 100644
index 0000000..9188896
--- /dev/null
+++ b/NG_2023_Kanban.DataLayer/Repositories/UserRepository.cs
@@ -0,0 +1,10 @@
+using NG_2023_Kanban.DataLayer.DbStartup;
+using NG_2023_Kanban.DataLayer.Entities;
+using NG_2023_Kanban.DataLayer.Interfaces;
+
+namespace NG_2023_Kanban.DataLayer.Repositories;
+
+public class UserRepository : BaseRepository<User>, IUserRepository
+{
+    public UserRepository(DatabaseContext context) : base(context) { }
+}
diff --git a/NG_2023_Kanban.DataLayer/Service/DataService.cs b/NG_2023_Kanban.DataLayer/Service/DataService.cs
deleted file mode 100644
index 27f5a62..0000000
--- a/NG_2023_Kanban.DataLayer/Service/DataService.cs
+++ /dev/null
@@ -1,59 +0,0 @@
-using NG_2023_Kanban.DataLayer.DbStartup;
-using NG_2023_Kanban.DataLayer.Entities;
-using Microsoft.EntityFrameworkCore;
-
-namespace NG_2023_Kanban.DataLayer.Service
-{
-    public class DataService
-    {
-        private readonly DatabaseContext _context;
-        public DataService(DatabaseContext context) 
-        {
-            _context = context;
-            _context.Database.EnsureCreated();
-        }
-
-        public async Task<User> AddAsync(User entity)
-        {
-            await _context.Set<User>().AddAsync(entity);
-            await _context.SaveChangesAsync();
-
-            return entity;
-        }
-
-        public async Task<User> GetByIdAsync(int id)
-        {
-            var entity = await _context.Set<User>().FirstOrDefaultAsync(x => x.Id == id);
-            
-            return entity;
-        }
-
-        public async Task<User> LoginAsync(string username, string password)
-        {
-            User? entity = await _context.Set<User>().FirstOrDefaultAsync(x => x.Username == username);
-
-            if (entity != null && entity.Password == password) // TODO: hashing
-                return entity;
-            return null;
-        }
-
-        public async Task<ICollection<User>> GetAllAsync()
-        {
-            var entities = await _context.Set<User>().Select(x => x).ToListAsync();
-
-            return entities;
-        }
-
-        public async Task UpdateAsync(User model)
-        {
-            _context.Set<User>().Update(model);
-            await _context.SaveChangesAsync();
-        }
-
-        public async Task DeleteAsync(User model) 
-        {
-            _context.Set<User>().Remove(model);
-            await _context.SaveChangesAsync();
-        }
-    }
-}
diff --git a/NG_2023_Kanban/Controllers/HomeController.cs b/NG_2023_Kanban/Controllers/HomeController.cs
index ffd9ab5..ea38165 100644
--- a/NG_2023_Kanban/Controllers/HomeController.cs
+++ b/NG_2023_Kanban/Controllers/HomeController.cs
@@ -3,19 +3,19 @@ using Microsoft.AspNetCore.Mvc;
 using NG_2023_Kanban.DataLayer.Entities;
 using NG_2023_Kanban.Extensions;
 using NG_2023_Kanban.DataLayer.Models;
-using NG_2023_Kanban.BusinessLayer.Service;
+using NG_2023_Kanban.BusinessLayer.Services;
 
 namespace NG_2023_Kanban.Controllers;
 
 public class HomeController : Controller
 {
-    private readonly BusinessService _service;
+    private readonly UserService _userService;
     private readonly ILogger<HomeController> _logger;
 
-    public HomeController(ILogger<HomeController> logger, BusinessService service)
+    public HomeController(ILogger<HomeController> logger, UserService userService)
     {
         _logger = logger;
-        _service = service;
+        _userService = userService;
     }
 
     public IActionResult Index()
@@ -39,13 +39,13 @@ public class HomeController : Controller
     }
 
     [HttpPost]
-    public async Task<IActionResult> Login(string username, string password)
+    public async Task<IActionResult> Login(User user)
     {
         User? currentAccount = HttpContext.Session.GetObject<User>("Account");
         if (currentAccount != null)
             return Redirect("/Home/Index");
 
-        User? account = await _service.LoginAsync(username, password);
+        User? account = await _userService.LoginAsync(user);
         if (account != null)
         {
             HttpContext.Session.SetObject("Account", account);
@@ -74,7 +74,7 @@ public class HomeController : Controller
     }
 
     [HttpPost]
-    public async Task<IActionResult> Register(string fullName, string username, string password)
+    public async Task<IActionResult> Register(User user)
     {
         User? currentAccount = HttpContext.Session.GetObject<User>("Account");
         if (currentAccount != null)
@@ -82,7 +82,7 @@ public class HomeController : Controller
 
         try
         {
-            User account = await _service.RegisterAsync(fullName, username, password);
+            User account = await _userService.RegisterAsync(user);
 
             HttpContext.Session.SetObject("Account", account);
             return Redirect("/Home/Index");