My object can't move left and right but only jump?

I can only make my object jump, but not move left and right? I can’t see why my code wouldn’t work.

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


public class PlayerController : MonoBehaviour {


	public CharacterController controller;

	private float gravity = 12.04f;
	private float jumpForce = 6f;
	private float verticalVelocity;

	public float speed;

	public Rigidbody rb;



	void Start () {
		rb = GetComponent<Rigidbody> ();
		controller = GetComponent<CharacterController> ();

	}



	void FixedUpdate(){

		float moveHorizontal = Input.GetAxis ("Horizontal");
		float moveVertical = Input.GetAxis ("Vertical");


		Vector3 movement = new Vector3 (moveHorizontal, moveVertical, 0.0f);


		rb.AddForce (movement * speed);
	}

	private void Update(){

		if (controller.isGrounded) {
			verticalVelocity = -gravity * Time.deltaTime;
			if (Input.GetKeyDown (KeyCode.Space)) {
				verticalVelocity = jumpForce;
			}
		} else {
			verticalVelocity -= gravity * Time.deltaTime;
		}



		Vector3 moveVector = Vector3.zero;
		moveVector.y = verticalVelocity;
		controller.Move (moveVector * Time.deltaTime);

	}

}

Vector3 movement = new Vector3 (moveHorizontal, moveVertical, 0.0f);

This line does this :
I move forward ( X ) by my moveHorizontal value.
I move up/down ( Y ) by my moveVertical value.
I move right/left( Z ) by 0.0f.

Try to put moveHorizontal instead of 0.0f, you should start moving in up/right or back/left.
If it works, then it means you need to get the correct input instead of 0.0f.
If you still can’t move in any other direction , then the problem is elsewhere.