What are the errors I'm making and how do I fix them

public class Player : MonoBehaviour { private Rigidbody2D myRigidbody;

 [SerializeField]

 private float movementSpeed;

 private bool facingRight;

 // Start is called before the first frame update
 void Start()
 {

     facingRight = true;

     myRigidbody = GetComponent<Rigidbody2D>();
 }






 // Update is called once per frame
 void FixedUpdate()
 {
     float horizontal = Input.GetAxis("Horizontal");

     HandleMovement(horizontal);

 }

 private void HandleMovement(float horizontal)
 {
     myRigidbody.velocity = new Vector2(horizontal * movementSpeed, myRigidbody.velocity.y);

 }

 private void flip(float horizontal);

}

  if (horizontal > 0 && !facingRight || horizontal < 0 && facingRight)



                                        facingRight = !facingRight;

      Vector3 theScale = transform.localScale;

 theScale.x *= -1;

     transform.localScale = *theScale*