lessons wanted on how to debug

Getting Started
1

hello all. I am working on this script for a pool game. I’m trying to set target position to mouse click and then hit ui button to send cue ball towards target position. problem is bool is enabled when I click mouse button not the ui button and I am not sure what the target position is being set to but its not the mouse position I intended.
just need to now how to get the target position in the console view or draw a line to it or whatever I need to do to find out where I am sending the ball.

public class aim : MonoBehaviour
{

    public Rigidbody rb;
    public bool strikeBall;
    private Vector3 targetPos;
   

    void start()
    {
        rb = GetComponent<Rigidbody>();
        strikeBall = false;
    }

    void FixedUpdate()
    {
        var mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        var mouseDir = mousePos;
        mouseDir.z = 0.0f;
        mouseDir = mouseDir.normalized;


        if (Input.GetMouseButtonDown(0))
        {
            targetPos = mousePos;
        }
        if (strikeBall)
        {

            rb.AddForce(targetPos, ForceMode.Impulse);
        }
    }
}

any input is appreciated.

2

Use Debug.Log.

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