How to add Speed

Questions & Answers
1

Hello Guys, i just want to ask if you have an idea to give a speed of rotation and movement of and object. This is my script I hope you can help me.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class NewMov : MonoBehaviour
{
private void Update()
{
if(Input.GetKey(KeyCode.R)){
transform.Rotate(new Vector3(0f, 180f, 0f));}

    else if (Input.GetKeyDown(KeyCode.UpArrow) && transform.position.x > 0 )
    {
        targetPos = new Vector3(transform.position.x - move , transform.position.y, transform.position.z );
        transform.position = targetPos;
    }else if(Input.GetKeyDown(KeyCode.DownArrow) && transform.position.x <  3)
    {
        targetPos = new Vector3(transform.position.x + move, transform.position.y, transform.position.z  );
        transform.position = targetPos;
    }
}

}
2

Hi may be better

public class NewMov : MonoBehaviour
{   
    [SerializeField] int score;
    [SerializeField] int health = 3;
    [SerializeField] private float _moveSpeed  = 1f;
    // MOVE
    private void Update()
    {   
        if(Input.GetKey(KeyCode.R))
        {
            transform.Rotate(new Vector3(0f, 180f, 0f));}
        }
        else if (Input.GetKeyDown(KeyCode.UpArrow) && transform.position.x > 0 )
        {
             transform.Translate(Vector3.forward  * _moveSpeed * Time.deltaTime, Space.World);
        }
        else if(Input.GetKeyDown(KeyCode.DownArrow) && transform.position.x <  3)
        {
            transform.Translate(Vector3.back * _moveSpeed * Time.deltaTime, Space.World);
        }
    }          
 }