HintText.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using TMPro;
public class HintText : MonoBehaviour
{
    public TMP_Text hintText;
    public GameObject GameHint;
    public float hintTime;
    public void ShowHint(string hint)
    {

    }

    public void OnTriggerEnter(Collider other)
    {
        StartCoroutine(HintTimer());
    }
    public IEnumerator HintTimer()
    {
        GameHint.SetActive(true);
        GameHint.SetActive(false);
        yield return new WaitForSeconds(hintTime);
    }
}