gimm-platformer-project/Assets/Scripts/PlatformManager.cs

using UnityEngine;

public class PlatformManager : MonoBehaviour
{
    // Array setup for platforms
    GameObject[] platforms;
    GameObject currentPlatform;
    int index;

    // GameObject for coin appearing above platform
    public GameObject coin;

    private void Start()
    {
        NewPlatform();
    }
    // Start is called before the first frame update
    public void NewPlatform()
    {
        platforms = GameObject.FindGameObjectsWithTag("Platform"); // Creates an array of all objects with the tag platform
        index = Random.Range(0, platforms.Length); // randomly selects one platform
        currentPlatform = platforms[index]; // registers random platform as the one the player must get to
        var position = currentPlatform.transform.position;
        coin.transform.position = new Vector2(position.x, position.y + 2f);
    }
}