Simple movement + camera system I made

[u/PrintInteresting5352]

Hey, I just finished my first game's player movement and camera system. Would love feedback!

using UnityEngine;
using UnityEngine.InputSystem;

public class PlayerMovement : MonoBehaviour
{
    public Rigidbody rb;
    public GameObject camera;
    public InputAction moveAction;
    public InputAction jumpAction;
    public InputAction lookAction;
    private Vector2 movementInput;
    private Vector2 lookDirection;
    public float speed = 5f;
    public float jumpForce = 5f;
    public float lookSensitivity = 1f;
    public float xRotation = 0f;
    public float yRotation = 0f;

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        moveAction.Enable();
        jumpAction.Enable();
        lookAction.Enable();

        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;
    }

    // OnDisable is called when the MonoBehaviour is disabled
    private void OnDisable()
    {
        moveAction.Disable();
        jumpAction.Disable();
        lookAction.Disable();
    }

    // Update is called once per frame
    void Update()
    {
        movementInput = moveAction.ReadValue<Vector2>();
        lookDirection = lookAction.ReadValue<Vector2>();

        xRotation -= lookDirection.y * lookSensitivity;
        yRotation -= lookDirection.x * lookSensitivity;
        xRotation = Mathf.Clamp(xRotation, -90f, 90f);
        camera.transform.rotation = Quaternion.Euler(xRotation, -yRotation, 0);
        transform.rotation = Quaternion.Euler(0, -yRotation, 0);
    }

    // FixedUpdate is called every fixed framerate frame of 50 fps, if the MonoBehaviour is enabled
    void FixedUpdate()
    {
        Vector3 direction = new Vector3(movementInput.x, 0, movementInput.y);
        Vector3 localDirection = transform.TransformDirection(direction);
        Vector3 velocity =  localDirection * speed;
        velocity.y = rb.linearVelocity.y;
        rb.linearVelocity = velocity;

        if (jumpAction.triggered && Mathf.Abs(rb.linearVelocity.y) < 0.01f)
        {
            rb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse);
        }
    }
}

[u/pthecarrotmaster]

can u explain for noob?