Nav Mesh agent will walk on mouse click position.

NavMeshAgentWalkOnClickPosition

using UnityEngine;
using UnityEngine.AI;

public class NavController : MonoBehaviour
{
	NavMeshAgent agent;
    // Start is called before the first frame update
    void Start()
    {
		agent = GetComponent<NavMeshAgent>();
    }

    // Update is called once per frame
    void Update()
    {

		if (Input.GetMouseButtonDown(0))
		{
			RaycastHit hit;
			if(Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, 100))
			{
				agent.destination = hit.point;
			}
		}
    }
}