No Overload for x?

I've been following the hack and slash tutorial, found here:http://www.burgzergarcade.com/hack-slash-rpg-unity3d-game-engine-tutorial

I am having multiple errors, like: UnityEngine.Vector3 does not contain a definition for transform No overload for method "Distance" takes '1' arguments and more, help would be greatly appreciated.

Here is my code: (Sorry cant get samples to work) using UnityEngine; using System.Collections;

public class Enemy : MonoBehaviour { public GameObject target; public float attackTimer; public float coolDown;

 // Use this for initialization
 void Start () {
     attackTimer = 0;
     coolDown = 2.0f;
 
 }
 
 // Update is called once per frame
 void Update () {
     if(attackTimer > 0)
             attackTimer -= Time.deltaTime;
         
 if(attackTimer < 0)
         attackTimer= 0;
     
     if(attackTimer == 0){
         Attack();
         attackTimer = coolDown;
     }

} private void Attack(){ float distance = Vector3.Distance (target.transform.position. transform.position);

 Vector3 dir = (target.transform.position = Transform.position).normalized;
 float direction = Vector3.Dot(dir, transform,forward);
     if (distance <2.5f){
         if (direction > 0) {
         PlayerHealth eh= (PlayerHealth) target.GetComponent("PlayerHeal");
         eh.AddjustCurrentHealth(-10);
         }
         }
         }}