Laptop to pc monitor?

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I have now built a full working pc together. But I want to use my old laptop as a monitor. I have already connected hdmi but I do not know now how I do the laptop monitor to the pc monitor. Windows + p I tested everything

Bu
Rh

The HDMI connection to the laptop brings you nothing. That's just an exit.
If the laptop has the right components, you may be able to project via Windows. You have to activate this on the laptop in the settings.
However, quality is lost and there's a significant delay.

Os

It is possible, by software, e.g. Use TeamViewer, or even Skype, to transfer the image from a computer to a running laptop. To be able to einricten, yes into the running Windows inside, then you need a real Monotor s.PC.Zudem you have in the image transfer from one computer to another always quite a delay.

Over a pure cable connection you can't turn a laptop into a monitor, all bilschiemanschlüsse on the laptop are only outputs. You will not be able to avoid buying a monitor