Fixed up the classes with voids

Assets/board.cs

@@ -1,6 +1,7 @@
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
+using properties;
 
 public class board : MonoBehaviour
 {
@@ -9,6 +10,7 @@ public class board : MonoBehaviour
     {
         public int houses; //Initialising houses
         public int hotels; //Initialising hotels
+        List<properties.Property> cards = new List<properties.Property>;
 
         public Board()
         {

Assets/player.cs

@@ -13,10 +13,10 @@ public class player : MonoBehaviour
 
         public Player()
         {
-            
+            money = 1500;
         }
 
-        public Move(int length) //This moves the player a certain length (what they got from rolling the dice).
+        public void Move(int length) //This moves the player a certain length (what they got from rolling the dice).
         {
             if (position + length < 40) //Checks if the player will not pass go.
             {
@@ -30,12 +30,12 @@ public class player : MonoBehaviour
             }
         }
 
-        public goToJail() //If the player needs to go to jail.
+        public void goToJail() //If the player needs to go to jail.
         {
             position = 40; //Special position for jail.
         }
 
-        public getOutOfJail(int length) //If the player is going out of jail.
+        public void getOutOfJail(int length) //If the player is going out of jail.
         {
             position = 10; //Moves the player out of jail.
             Move(length); //Then moves the player.

Assets/properties.cs

@@ -2,87 +2,89 @@
 using System.Collections.Generic;
 using UnityEngine;
 
+public class Property
+{
+    public string title; //The name of the property.
+    public string group; //The colour, station or utility.
+    public int value; //How much it costs to buy.
+    public int houseCost; //How much it costs to buy a house on that property.
+    public int houses = 0; //How many houses it has. (Can have up to 4)
+    public bool hotel = false; //Whether it has a hotel or not. (Can only have 1)
+    public bool mortgage = false; //Whether the property has been mortgaged.
+
+    public Property(string name, string importGroup, int importValue, int house) //For houses.
+    {
+        //Initialising all the variables.
+        title = name;
+        group = importGroup;
+        value = importValue;
+        houseCost = house;
+    }
+
+    public Property(string name, string importGroup, int importValue) //For stations or utility.
+    {
+        //Initialising all the variables.
+        title = name;
+        group = importGroup;
+        value = importValue;
+    }
+
+    public void addHouse() //Used to add a house.
+    {
+        if (!mortgage && (houses < 4) && !hotel) //Checks if there is not a mortgage and there are less than 4 houses and that there isn't a hotel.
+        {
+            houses += 1; //Adds a house to the property.
+        }
+    }
+
+    public void removeHouse() //Used to remove a house.
+    {
+        if (houses > 0) //Checks if there is at least 1 house on the property.
+        {
+            houses -= 1; //Removes the house from the property.
+        }
+    }
+
+    public void addHotel() //Used to add a hotel.
+    {
+        if (houses == 4) //Checks if the user has enough houses.
+        {
+            houses = 0; //Removes all the houses.
+            hotel = true; //Creates the hotel.
+        }
+    }
+
+    public void removeHotel() //Removes the hotel.
+    {
+        if (hotel) //Checks if they have a hotel already.
+        {
+            houses = 4; //Gives the user back their 4 houses.
+            hotel = false; //Removes the hotel.
+
+        }
+    }
+
+    public void mortgageProperty() //Mortgages the property.
+    {
+        if (!hotel && (houses == 0)) //Checks if there is not a hotel and if there are no houses.
+        {
+            mortgage = true; //Mortgages the property.
+        }
+    }
+
+    public void unmortgageProperty() //Removes the mortgage on the property.
+    {
+        if (mortgage) //Checks if the property has been mortgaged.
+        {
+            mortgage = false; //Removes the mortgage.
+        }
+    }
+}
+
+
 public class properties : MonoBehaviour
 {
 
-    public class Property
-    {
-        public string title; //The name of the property.
-        public string group; //The colour, station or utility.
-        public int value; //How much it costs to buy.
-        public int houseCost; //How much it costs to buy a house on that property.
-        public int houses = 0; //How many houses it has. (Can have up to 4)
-        public bool hotel = false; //Whether it has a hotel or not. (Can only have 1)
-        public bool mortgage = false; //Whether the property has been mortgaged.
-
-        public Property(string name, string importGroup, int importValue, int house) //For houses.
-        {
-            //Initialising all the variables.
-            title = name;
-            group = importGroup;
-            value = importValue;
-            houseCost = house;
-        }
-
-        public Property(string name, string importGroup, int importValue) //For stations or utility.
-        {
-            //Initialising all the variables.
-            title = name;
-            group = importGroup;
-            value = importValue;
-        }
-
-        public addHouse() //Used to add a house.
-        {
-            if (!mortgage && (houses < 4) && !hotel) //Checks if there is not a mortgage and there are less than 4 houses and that there isn't a hotel.
-            {
-                houses += 1; //Adds a house to the property.
-            }
-        }
-
-        public removeHouse() //Used to remove a house.
-        {
-            if (houses > 0) //Checks if there is at least 1 house on the property.
-            {
-                houses -= 1; //Removes the house from the property.
-            }
-        }
-
-        public addHotel() //Used to add a hotel.
-        {
-            if (houses == 4) //Checks if the user has enough houses.
-            {
-                houses = 0; //Removes all the houses.
-                hotel = true; //Creates the hotel.
-            }
-        }
-
-        public removeHotel() //Removes the hotel.
-        {
-            if (hotel) //Checks if they have a hotel already.
-            {
-                houses = 4; //Gives the user back their 4 houses.
-                hotel = false; //Removes the hotel.
-
-            }
-        }
-
-        public mortgageProperty() //Mortgages the property.
-        {
-            if (!hotel && (houses = 0)) //Checks if there is not a hotel and if there are no houses.
-            {
-                mortgage = true; //Mortgages the property.
-            }
-        }
-
-        public unmortgageProperty() //Removes the mortgage on the property.
-        {
-            if (mortgage)
-            {
-                mortgage = false;
-            }
-        }
-    }
 
     // Start is called before the first frame update
     void Start()