How Do I Display Data Related Tables In Mvc4

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C#

ASP.NET

LINQ

MVC

MVC4

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I have the following classes:

public partial class Category
{
    public Category()
    {
        this.CategoryUsers = new HashSet<CategoryUser>();
        this.Entries = new HashSet<Entry>();
    }

    public int CategoryID { get; set; }
    public string CatagoryName { get; set; }

    public virtual ICollection<CategoryUser> CategoryUsers { get; set; }
    public virtual ICollection<Entry> Entries { get; set; }
}

public partial class User
{
    public User()
    {
        this.CategoryUsers = new HashSet<CategoryUser>();
        this.Entries = new HashSet<Entry>();
    }

    public int UserID { get; set; }

    [Required(ErrorMessage = "Please provide full name", AllowEmptyStrings = false)]
    public string FullName { get; set; }

    [Required(ErrorMessage = "Please provide username", AllowEmptyStrings = false)]
    public string Username { get; set; }

    [DataType(System.ComponentModel.DataAnnotations.DataType.Password)]
    [StringLength(50, MinimumLength = 6, ErrorMessage = "Password must be minimum 6 char long.")]
    [Required]
    public string Password { get; set; }

    [Compare("Password", ErrorMessage = "Confirm password dose not match.")]
    [DataType(System.ComponentModel.DataAnnotations.DataType.Password)]
    [Required]
    public string ConfirmPassword { get; set; }

    public virtual ICollection<CategoryUser> CategoryUsers { get; set; }
    public virtual ICollection<Entry> Entries { get; set; }
}

public partial class CategoryUser
{
    public int Category_User_ID { get; set; }
    public int Fk_Category { get; set; }
    public int Fk_User { get; set; }

    public virtual Category Category { get; set; }
    public virtual User User { get; set; }
}

public partial class Entry
{
    public int EntryID { get; set; }
    public string Title { get; set; }
    public string Username { get; set; }
    public string Password { get; set; }
    public string Url { get; set; }
    public string Description { get; set; }
    public int Fk_Category { get; set; }
    public int Fk_User { get; set; }

    public virtual Category Category { get; set; }
    public virtual User User { get; set; }
}

The user controller:

public class UserController : Controller
   {
       [HttpGet]
       public ActionResult Index()
       {
           return View();
       }

       [HttpGet]
       public ActionResult Register()
       {
           return View();
       }

       [HttpPost]
       [ValidateAntiForgeryToken]
       public ActionResult Register(User user)
       {
           if (ModelState.IsValid)
           {
               using (PasswordCloudEntities _db = new PasswordCloudEntities())
               {

                   var count = _db.Users.Count(u => u.Username == user.Username);

                   if (count == 0)
                   {
                       _db.Users.Add(user);

                       _db.SaveChanges();

                       ModelState.Clear();

                       user = null;

                       ViewBag.Message = "Successfully Registration Done";
                   }
                   else
                   {
                       ViewBag.Message = "Registration failed. Username already exists.";
                   }
               }
           }

           return PartialView(user);
       }

       [HttpGet]
       public ActionResult LogIn()
       {
           return View();
       }

       [HttpPost]
       [ValidateAntiForgeryToken]
       public ActionResult LogIn(User user)
       {
           if (IsValid(user.Username, user.Password))
           {
               FormsAuthentication.SetAuthCookie(user.Username, false);
               return RedirectToAction("Index", "Home");
           }
           else
           {
               ModelState.AddModelError("", "Login details are wrong.");
           }

           return PartialView(user);
       }

       public ActionResult LogOut()
       {
           FormsAuthentication.SignOut();
           return RedirectToAction("Index", "Home");
       }

       private bool IsValid(string username, string password)
       {
           bool IsValid = false;

           using (var db = new PasswordCloudEntities())
           {
               var user = db.Users.FirstOrDefault(u => u.Username == username);
               if (user != null)
               {
                   if (user.Password == password)
                   {
                       IsValid = true;
                   }
               }
           }
           return IsValid;
       }
   }

So i am beginner in MVC, i've made user to register and log in, now i need depending of the logged user to display categories, and then from the selected category to display the entry that user entered. Can someone guide and help me with the next steps.