CS0106 (16,5) and CS1513 (36,2) errors

Unity Engine
,
1 
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Enemy : MonoBehaviour
{
    public int maxHealth = 100;
    int currentHealth;

    // Start is called before the first frame update
    void Start()
    {
        currentHealth = maxHealth;
    {
       
    public void TakeDamage(int damage)
    {
        currentHealth -= damage;

        // Play hurt animation

        if(currentHealth <= 0)
        {
         Die();
        }
    }
    void Die()
    {
     Debug.Log("Enemy died!");

     // Die animation

     // Disable the enemy
   
    }
}
2

I’m first day in unity and when I click on play on my poject, these two errors show. Please anyone help me