2D Game - Y axis rotation (left - right)

Hello everyone, i'm doing a simple 2D Game. Of course, trough < and > arrows you're allowed to walk. I made idle and walk animations successfully, now i would like to rotate my sprite to left when he's walking to left, and to right when he walks to right.

I tried many rotation functions but i made some mistakes, can i know the right way? P.S: I'm using C#.

Here's my Player code:

 using UnityEngine;
 using System.Collections;
 
 public class PlayerController : MonoBehaviour {
     
     public float Speed = 4;
     public float position;
     
     protected Animator animator;
     
     void Start () {
         animator = GetComponent<Animator>();
         position = transform.position.x;
     }
 
     void Update () {
         position = transform.position.x;
         transform.Translate(Vector3.right * Input.GetAxis("Horizontal") * Speed * Time.deltaTime);
         
         if(position < transform.position.x) {
             animator.SetBool("WalkVar", true);
         } else if(position > transform.position.x) {
             animator.SetBool("WalkVar", true);
         } else {
             animator.SetBool("WalkVar", false);
         }
     }
 }