Using NavMeshAgent in Unity – Unity By Example

NavMeshAgent is a component in Unity 3D that provides automatic pathfinding for game characters based on a navigation mesh. This component allows you to create “smart” characters that can automatically move towards a specified point, avoiding obstacles in their path.

Steps

Create script PlayerController.cs

using System;
using UnityEngine;
using UnityEngine.AI;

[RequireComponent(typeof(NavMeshAgent))]
public class PlayerController : MonoBehaviour
{
    private enum AnimationKeys
    {
        Walking
    }

    private NavMeshAgent _agent;
    private Animator _animator;

    private void Start()
    {
        _agent = GetComponent<NavMeshAgent>();
        _animator = GetComponent<Animator>();
    }

    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.Mouse0))
        {
            RaycastHit hit;
            if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, Mathf.Infinity))
            {
                _agent.SetDestination(hit.point);
                _animator.SetBool(AnimationKeys.Walking.ToString(), true);
            }
        }

        if (!_agent.pathPending && _agent.remainingDistance < 0.1f)
        {
            _animator.SetBool(AnimationKeys.Walking.ToString(), false);
        }
    }
}

To open the Navigator menu, go to Windows > AI > Navigation.
Go to the Object tab and select the ground. Check the box next to Navigation Static and choose the Walkable option in Navigation Area.

Go to the Object tab and select the walls. Check the box next to Navigation Static and choose the No Walkable option in Navigation Area.
Go to the Bake tab and set up parameters for the player.