2D Character Controller glitches and doesn’t really feel smooth. Why?

Questions & Answers
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1

I have 2 scripts for my character the first one is for my capsule and the second one is for my camera.

I tried it but it won’t work as intended it just glitches and doesn’t really feel smooth, any improvements?

using System;
using UnityEngine;

public class PlayerScript : MonoBehaviour
{
    public float mouseSensitivity = 100.0f;
    public float clampAngle = 80.0f;
    
    private float rotY = 0.0f;
    private float rotX = 0.0f;
    private float walkSpeed = 1.5f;
    private float runMult = 1f;
    private CapsuleCollider collideCollider;
    
    void Start ()
    {
        Vector3 rot = transform.localRotation.eulerAngles;
        rotY = rot.y;
        rotX = rot.x;
        collideCollider = GetComponent<CapsuleCollider>();
    }
    
    void Update ()
    {
        float mouseX = Input.GetAxis("Mouse X");
        
        rotY += mouseX * mouseSensitivity * Time.deltaTime;
        
        Quaternion localRotation = Quaternion.Euler(0.0f, rotY, 0.0f);
        transform.rotation = localRotation;
        
        bool isWalk = Input.GetKey(KeyCode.W);
        bool isRun = Input.GetKey(KeyCode.LeftShift);
          
        if (isRun) {
            runMult = 2;
        }
          
        if (isWalk) {
            transform.position += transform.forward * Time.deltaTime * walkSpeed * runMult;
        }
    }
}

The second script is:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameraScript : MonoBehaviour
{
    private float rotX;
    public float mouseSensitivity = 100f;
    public float clampAngle = 40f;
    void Update()
    {
        float mouseY = -Input.GetAxis("Mouse Y");        
        rotX += mouseY * mouseSensitivity * Time.deltaTime;        
        rotX = Mathf.Clamp(rotX, -clampAngle, clampAngle);        
        Quaternion localRotation = Quaternion.Euler(rotX, 0.0f, 0.0f);
        transform.rotation = localRotation;
    }
}

I would really like some improved solution.

2

Gameplay programmer rules:

  1. Player’s CapsuleCollider must be accompanied by a RigidBody component.
  2. Never move a RigidBody using transfom property. Use rb.velocity = vel; preferably or rb.position = pos; in shame.
  3. Never parent a Camera to a RigidBody. Never.
  4. You do not talk about Unity documentation page.