I am a begginer trying to make a simple 2d platformer. Need help with rotation and jump height.

So, I am a beginner. Just started attempting to make a platformer today instead of following planned projects for once. . I was trying my best to work through it without to much copy and pasting of code and using it to build my knowledge as a beginner. I have gotten confused on rotating the sprite when walking left and right though. Could you tell me how to make my code work for this ? Atm with how it is now it will rotate in that direction at a fixed speed when i run and it just keeps turning around in circles. Going nowhere fast. lol I estimate this question is probably pretty simple to solve. As I'm obviously just not using the correct method.

My second question however i think is a bit tougher. Basically with the code set up in the current way i can get my sprite to jump pretty consistently without double jumps. Which is better then what i have had in the past. But what i need to do is completely normalize the jumping "thrust". With things how they are now every once in awhile i will get a high jump anywhere between 2 to 5 times my normal jump height. This cant happen if im trying to jump between platforms and have crates to stack in order to navigate longer jumps like i have set up now in my sample scene that i just started working on. Is there a way to set a failsafe to make sure the jumps stay consistant in height and distance with a rigidbody 2d like i have now ? Or better yet is there a way to do that as a beginner without being completely confused as to how it works. Thanks for your time and hope to hear back on this. I am sure my first question is kind of stupid but cant seem to figure it out.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Animations;
 using UnityEngine.UI;
 using UnityEngine.SceneManagement;

 public class playerController : MonoBehaviour
 {
     [SerializeField]
     private Animator playeranim;
     private Rigidbody2D rb2d;
    // private BoxCollider2D box2d;
     [SerializeField]
     private int thrust = 100;
     [SerializeField]
     private int jumpHeight = 50;
     [SerializeField]
     private int canJump;
     private Vector2 direction;
 

     // Use this for initialization
         void Start ()
     {
         rb2d = gameObject.GetComponent<Rigidbody2D>();
        // box2d = gameObject.GetComponent<BoxCollider2D>();
     }
 
     // Update is called once per frame
     void Update ()
     
     {
         RotateDirection();
         playeranim = gameObject.GetComponent<Animator>();
         rigidbodymovement();

    
     }

     private void rigidbodymovement()
     {
     

         if (Input.GetKey(KeyCode.D))

         {

             playeranim.SetInteger("running", 2);


             rb2d.AddForce(transform.right * thrust * Time.deltaTime);

         }

         else if (Input.GetKey(KeyCode.A))
         {
        

             playeranim.SetInteger("running", 2);


             rb2d.AddForce(-transform.right * thrust * Time.deltaTime);



         }

         else
             playeranim.SetInteger("running", 0);
         playeranim.SetInteger("jump", 0);


         if (Input.GetKeyDown(KeyCode.Space))  // todo fix double jump and a glitch where the player 
 turns his body when jumping and controls glitch
         {
             if( canJump > 1)
             {
                 canJump = canJump - 1;
             
                 rb2d.AddForce(new Vector2(0, 1) * jumpHeight * Time.deltaTime);
             }
         
         }

     
     {
     
     }




     // }

     //else
     //{
     //  playeranim.SetBool("is_Running", false);
     //  playeranim.SetBool("is_Idle", true);
     // }
 }
     private void OnCollisionEnter2D(Collision2D collision)
     {
         switch ( collision.gameObject.tag)
         {
             case "water":
                 {
                     Invoke("death", 1f);
                     break;
                 }
             case "floor":
                 {
                     Debug.Log("i am touching the floor");
                     canJump = 2;
                     break;
                 }

             default:
                 {
                     canJump = 1;
                     break;
                 }
         }
     }

     private void RotateDirection()

      {
      transform.Rotate(direction);

      direction = Vector2.zero;
   
     if (Input.GetKey(KeyCode.A))
      {
             direction += new Vector2(0, 1);
      }
  
     if (Input.GetKey(KeyCode.D))
       {
             direction += new Vector2(0,1 );
      }



     }

      private void death()
     {
     

         SceneManager.LoadScene(0);
     }
 }