A simple Click to Move player controller using a Unity Navmesh Agent.

ClickToMoveController.cs

using UnityEngine;
using UnityEngine.AI;

namespace MegaCrush.NavmeshBaker.Sample
{
    /// <summary>
    /// A very simple click to move player controller
    /// </summary>
    [RequireComponent(typeof(NavMeshAgent))]
    public class ClickToMoveController : MonoBehaviour
    {
        private NavMeshAgent agent;
        private Vector3 movePosition;
        private Camera mainCam;
        private Ray ray;
        private RaycastHit hit;
        private float distance = 1000;
        
        private void Start()
        {
            agent = GetComponent<NavMeshAgent>();
            mainCam = Camera.main;
        }

        private void Update()
        {
            if (!Input.GetMouseButtonDown(0)) return;
            
            ray = mainCam.ScreenPointToRay(Input.mousePosition);
            if (Physics.Raycast(ray, out hit, distance))
            {
                movePosition = hit.point;
            }
            // move the agent to the position
            agent.SetDestination(movePosition);
        }
    }
}