Перемещение игрока по оси х

Vector2 vector = transform.position;//в Strart
//в Update
var direction = Vector2.right;
transform.position = new Vector2(vector.x + direction.x * Time.deltaTime, transform.position.y)

Vector3 vector = transform.position;//в Strart
//в Update
var direction = Vector3.left;
transform.position = new Vector3(Mathf.Clamp(vector.x + direction.x * Time.deltaTime, vector.x, vector.x + direction.x), transform.position.y, transform.position.z);

Vector3 vector; //поставьте отдельно перед стартом в тело класса
//потом
vector = transform.position;//в Strart
//в Update
var direction = Vector3.left;
transform.position = new Vector3(Mathf.Clamp(vector.x + direction.x * Time.deltaTime, vector.x, vector.x + direction.x), transform.position.y, transform.position.z);

transform.position = new Vector3(transform.position.x - 1, transform.position.y, transform.position.z);

transform.position = Vector3.MoveTowards(transform.position, new Vector3(transform.position.x - 1, transform.position.y, transform.position.z), .5f  * Time.deltaTime);

Vector3 target = new Vector3(transform.position.x - 1, transform.position.y, transform.position.z) - transform.position;
transform.position = Vector3.MoveTowards(transform.position, target, .5f  * Time.deltaTime);

using UnityEngine;
 
public class Movement : MonoBehaviour
{
    public float Speed = 3f; // скорость передвижения
    public float Step = 1f; // ширина шага
 
    private Vector3 _targetPos;
    private Vector3 _currentPos;
 
    void Start()
    {
        _currentPos = _targetPos = transform.position;
    }
 
    void Update()
    {
        if (Input.GetKeyDown(KeyCode.RightArrow))
            _targetPos.x += Step;
 
        if (Input.GetKeyDown(KeyCode.LeftArrow))
            _targetPos.x -= Step;
 
        if (_currentPos != _targetPos)
        {
            _currentPos = Vector3.MoveTowards(_currentPos, _targetPos, Speed * Time.deltaTime);
            transform.position = _currentPos;
        }
    }
}