error CS0111 (help)

Unity Engine
1

i have this error in my code and i dont know what to do about it please help:

Assets\scripts\controller\Movement.cs(17,10): error CS0111: Type ‘Movement’ already defines a member called ‘Start’ with the same parameter types

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Movement : MonoBehaviour
{
    float Speed;

    public Rigidbody rb;
    public bool PlayerOnGround = true;

    private void Start()
    {
        rb = GetComponent<Rigidbody>();
    }
    // Start is called before the first frame update
    void Start()
    {
        Speed = 5;
    }

    // Update is called once per frame
    void Update()
    {
        transform.Translate(Input.GetAxis("Horizontal") * Time.deltaTime * Speed, 0, Input.GetAxis("Vertical") * Time.deltaTime * Speed);

        if(Input.GetKey(KeyCode.UpArrow)) {
            transform.Translate(5, 0, 10 * Time.deltaTime);
        }
        if(Input.GetKey(KeyCode.DownArrow)) {
            transform.Translate(5, 0, -10 * Time.deltaTime);
        }
        if(Input.GetKey(KeyCode.LeftArrow)) {
            transform.Translate(-10 * Time.deltaTime, 0, 0);
        }
        if(Input.GetKey(KeyCode.RightArrow)) {
            transform.Translate(10 * Time.deltaTime, 0, 0);
        }
        if(Input.GetButtonDown("w")) {
            if(Input.GetButtonDown("left shift")){
                transform.Translate(10 * Time.deltaTime * 3f, 0, 0);
            }
           
        }
       
        if(Input.GetButtonDown("jump") && PlayerOnGround)
        {
            rb.AddForce(new Vector3(0, 5, 0), ForceMode.Impulse);
            PlayerOnGround = false;
        }
    }

    private void OnCollisionEnter(Collision collision)
    {
        if(collisionn.gameObject.tag == "ground")
        {
            PlayerOnGround = true;
        }
    }
}

[code]
2

you have 2x the same function

    private void Start()
    {
        rb = GetComponent<Rigidbody>();
    }
    // Start is called before the first frame update
    void Start()
    {
        Speed = 5;
    }

change it to:

private void Start()
    {
        rb = GetComponent<Rigidbody>();
        Speed = 5;
    }
3

thank you