About AI moving randomly or use A* Pathfinding

There is resources on this site for A* Pathfinding, just have a look around the site and you'll find a couple resources on it. You can also find alot of pathfinding techniques on youtube. Wandering AI's are a little tricky tho because it can take a long time to write a complex wandering AI script that works good for the environment in your game, Especially if it's an open world where it's wandering. I'll put a very simple free roaming AI script down but remember it's very basic. You'll have to adjust where needed a add a few things depending on your environment. I got this script from steamisM50 but converted it from c# to javascript and taking out some of the stuff you won't need. He has quite a few tutorials on AI so I suggest having a look at his videos.

Wandering AI Script:

 var moveSpeed : float = 2;
 var rotSpeed : float = 10;
 var moveDir : int = 1;
 
 function Update()
 {
     if(!Physics.Raycast(transform.position, transform.forward, 5))
     {
         transform.Translate(Vector3.forward * moveSpeed * Time.smoothDeltaTime);
     }
     else
     {
         if(Physics.Raycast(transform.position, - transform.right, 1))
         {
             moveDir = 1;
         }
         else if(Physics.Raycast(transform.position, transform.right, 1))
         {
             moveDir = -1;
         }
         transform.Rotate(Vector3.up, 90 * rotSpeed * Time.smoothDeltaTime * moveDir);
     }
 }

WayPoint Script:

 var waypoints : Transform[];
 var speed : int = 2;
 private var currentWaypoint : int;
 var loop : boolean = true;
 var player : Transform;
 
 function Start()
 {
     player = GameObject.FindWithTag("Player").transform;
 }
 
 function Update()
 {
     if(currentWaypoint < waypoints.length)
     {
         
         var target : Vector3 = waypoints[currentWaypoint].position;
         var moveDirection : Vector3 = target - transform.position;
         var range : Vector3 = player.position - transform.position;
         
         var velocity = rigidbody.velocity;
         if(moveDirection.magnitude < 1)
         {
             currentWaypoint++;
         }
         else if(range.magnitude < 10)
         {
             
             velocity = Vector3.zero;
             target = player.position;
         }
         else
         {
             velocity = moveDirection.normalized * speed;
         }
     }
     else
     {
         if(loop)
         {
             currentWaypoint = 0;
         }
         else
         {
             velocity = Vector3.zero;
         }
     }
     rigidbody.velocity = velocity;
     transform.LookAt(target);
 }

To add the WayPoint script just make as many empty game objects as you need and name them Waypoint1 etc... attach the script to the AI and drag and drop the waypoints.