HDMI from One to laptop

All you do is plug the HDMI from your PC into the HDMI IN port on the back of the console and it will show up as TV on your Xbox One (ie, "Xbox, go to TV" will show you your laptop screen).

You set it up through the Oneguide app. Basically the same app you use to run your cable or satellite box through to watch TV. Honestly it's just putting in a middle man to stream content your already streaming with another device. The X1 adds no value
to the equation, it would be better to just run the HDMI cord directly to your TV.

Can you post the exact make and model of your laptop to check if it's a laptop with HDMI-In?

Just be aware that 99% of laptops do NOT have a HDMI in port, as that would cost additional licensing fees from the HDMI consortium, and since most people don't need a HDMI in, they always try to cut these costs by not including a HDMI in.

If there is only one HDMI port on your laptop, then it's only a HDMI out port, and you can't use it to connect your Xbox to it.

In most cases, you're better off buying a cheap computer monitor with HDMI input and use that, in case your laptop only has HDMI out.

If your laptop has only one HDMI port it most certainly will only be HDMI out. Which means you can't use the laptop as a display. About 99% of laptops are HDMI out only.

There are very few laptops with HDMI input. The only ones I'm aware of are some of AlienWare's 17" and 18" models. Most laptops with an HDMI port have HDMI outputs, not inputs.