CSHARP

basic movement script unity

public float speed = 5;

void Update() {
    float x = Input.GetAxisRaw("Horizontal");
    float y = Input.GetAxisRaw("Vertical");     
    gameObject.transform.Translate(new Vector3(x,y,0) * speed * Time.deltaTime);
}

unity movement

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

public class 2dMovement : MonoBehaviour
{
  //This also works with joystick, PS this is topdown movement

 private Rigidbody2D rb;
 public float MoveSpeed = 15f;


 void Start ()
 {
   rb = GetComponent<Rigidbody2D>(); 
 }

 void Update ()
 {
    private float vertical;
    private float horizontal; 
 
    horizontal = Input.GetAxisRaw("Horizontal");
    vertical = Input.GetAxisRaw("Vertical"); 
 }

 private void FixedUpdate()
 {  
    rb.velocity = new Vector2(horizontal * MoveSpeed, vertical * MoveSpeed);
 }
}

unity ui movement

//You can do something like applying a force to a rigidbody or do something like this

        float singleStep = 1f * Time.deltaTime;
        Vector3 LookDir = new Vector3(LookJoystick.Horizontal, 0, LookJoystick.Vertical);
        Vector3 newDirection = Vector3.RotateTowards(transform.forward, -LookDir, singleStep, 0.0f);
        transform.rotation = Quaternion.LookRotation(+newDirection);//but that has limits

also make sure you have this asset installed