csharp/oop/inheritance

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace NEwproyeckt
{
    public class Champions
    {
        public int health = 100;
        public int basedamage = 30;

        public void Passive()
        {

        }
        public void BasicAttack()
        {
            Console.WriteLine(basedamage * 0.25);
        }
        public void firstSkill()
        {
            Console.WriteLine();
        }
        public void secondSkill()
        {

        }
        public void thirdSkill()
        {

        }
        public void Ultimate()
        {
            Console.WriteLine("Uses his ultimate");
        }

    }

    public class Melee : Champions
    {
        public int range = 3;
        public int movementspeed = 9;

    }
    public class Marksman : Champions
    {
        public int range = 15;
        public int movementspeed = 5;
    }

    public class Yasuo : Melee
    {
        public int health = 120;
        public int basedamage = 23;

        public double iskillcooldown = 0.24;
        public double iiskillcooldown = 25;
        public int iiiskillcooldown = 25;
        public int ultimate = 125;
        public void BasicAttack()
        {
            Console.WriteLine(basedamage * 0.24);
        }
        public void Ultimate()
        {
            Console.WriteLine("Soryegaton!");
        }
        public void Voiceline()
        {
            Console.WriteLine("Death is like a wind, always by my side");
        }
    }
    public class Vayne : Marksman
    {
        public int health = 120;
        public int basedamage = 23;

        public int iskillcooldown = 25;
        public int iiskillcooldown = 25;
        public int iiiskillcooldown = 25;
        public int ultimate = 180;

        public void BasicAttack()
        {
            Console.WriteLine(basedamage * 0.24);
        }
        public void Voiceline()
        {
            Console.WriteLine("Let us hunt those who have fallen to Darkness");
        }
    }
}

\\\\\\

using System;
using NEwproyeckt;
public class main
{
    public static void Main(string[] args)
    {
        Yasuo Player1 = new Yasuo();
        Vayne Player2 = new Vayne();

        bfsword item1 = new bfsword();

        item1.purchaseItem();

        Console.WriteLine(Player1.health);
        Player1.BasicAttack();

        Player1.Ultimate();
        Player2.Ultimate();
        Console.WriteLine("Yasuo Range: " + Player1.range);
        Console.WriteLine("Vayne Range: " + Player2.range);

        Player1.Voiceline();
    }
}

\\\\

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace NEwproyeckt
{
    public class items
    {
        public String description = "";

        public void purchaseItem()
        {

        }
        public void sellItem()
        {

        }
        public void useItem()
        {

        }
    }

    public class bfsword : items
    {
        public int dmg = 25;
    }
}