Several changes before queryDatabase project

CodeFirstExistingDatabase/Course.cs

@@ -17,12 +17,10 @@ namespace CodeFirstExistingDatabase
 
         public int Id { get; set; }
 
-        public string Title { get; set; }
+        public string Name { get; set; }
 
         public string Description { get; set; }
 
-        public Category Category { get; set; }
-
         public int Level { get; set; }
 
         public float FullPrice { get; set; }