How do I make a 3D Rigidbody move along a path indefinitely?

Questions & Answers
1

Is there a way to where I can make a script with an array of Transforms that will have the rigidbody move towards them in order?

EG:
Point A → Point B → Point C → Point A …

2

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
public class Test : MonoBehaviour
{
public Transform Destinations;
public NavMeshAgent agent;

    void FixedUpdate()
    {
        for (int i = 0; i < Destinations.Length;)
        {
         agent.SetDestination(Destinations*.position);*

if(agent.transform.position.x == Destinations*.position.x)i++;*
}
}

use NavMeshAgent Instead