HELP!! I am using this code to move player(cube) but it is not going staight.

Unity Engine
1 
using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
    private Vector3 targetPos;
    public float Xincrement;

    public float speed;
    public Rigidbody rb;
    public float forwardForce = 2000f;
    void FixedUpdate()
    {
        transform.position = Vector3.MoveTowards(transform.position, targetPos,speed*Time.deltaTime);
        rb.AddForce(0, 0, forwardForce * Time.deltaTime);

        if (Input.GetKey("left"))
        {
            targetPos = new Vector3(transform.position.x - Xincrement, transform.position.y, transform.position.z);
        }
           
        if (Input.GetKey("right"))
        {
            targetPos = new Vector3(transform.position.x + Xincrement, transform.position.y, transform.position.z);
        }


    }
   
}
2

You’re both changing transform.position and you’re adding force. It’s contradictory. Please explain what “going straight” means for you and take your time to try the tutorials like “Roll a ball”. You can find it in Unity Hub → Learn → Projects

3

“going straight” means i want to move cube along z axis on a ground of size (15,0.2,6000) and dodge obstacle(like cuboid ).