NavMesh Agent Basics

using UnityEngine;
using UnityEngine.AI;

public class EnemyAI : MonoBehaviour
{
    [SerializeField] private Transform target;
    private NavMeshAgent _agent;

    private void Awake() => _agent = GetComponent<NavMeshAgent>();

    private void Update()
    {
        if (target == null) return;
        _agent.SetDestination(target.position);

        // Check arrival
        bool arrived = !_agent.pathPending &&
                       _agent.remainingDistance <= _agent.stoppingDistance;
        if (arrived) OnReachTarget();
    }

    private void OnReachTarget() => Debug.Log("Enemy reached target!");
}