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

@@ -2,9 +2,6 @@
 using System.Collections.Generic;
 using UnityEngine;
 
-public class properties : MonoBehaviour
-{
-
 public class Property
 {
     public string title; //The name of the property.
@@ -32,7 +29,7 @@ public class properties : MonoBehaviour
         value = importValue;
     }
 
-        public addHouse() //Used to add a house.
+    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.
         {
@@ -40,7 +37,7 @@ public class properties : MonoBehaviour
         }
     }
 
-        public removeHouse() //Used to remove a house.
+    public void removeHouse() //Used to remove a house.
     {
         if (houses > 0) //Checks if there is at least 1 house on the property.
         {
@@ -48,7 +45,7 @@ public class properties : MonoBehaviour
         }
     }
 
-        public addHotel() //Used to add a hotel.
+    public void addHotel() //Used to add a hotel.
     {
         if (houses == 4) //Checks if the user has enough houses.
         {
@@ -57,7 +54,7 @@ public class properties : MonoBehaviour
         }
     }
 
-        public removeHotel() //Removes the hotel.
+    public void removeHotel() //Removes the hotel.
     {
         if (hotel) //Checks if they have a hotel already.
         {
@@ -67,23 +64,28 @@ public class properties : MonoBehaviour
         }
     }
 
-        public mortgageProperty() //Mortgages the property.
+    public void mortgageProperty() //Mortgages the property.
     {
-            if (!hotel && (houses = 0)) //Checks if there is not a hotel and if there are no houses.
+        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.
+    public void unmortgageProperty() //Removes the mortgage on the property.
     {
-            if (mortgage)
+        if (mortgage) //Checks if the property has been mortgaged.
         {
-                mortgage = false;
+            mortgage = false; //Removes the mortgage.
         }
     }
 }
 
+
+public class properties : MonoBehaviour
+{
+
+
     // Start is called before the first frame update
     void Start()
     {