LAN hotspot from a laptop?

I have a LAN connection to my PC about 200 kbits and in games more than 200 ms ping.

My father has a laptop that I used to test the Wi-Fi and it has almost 6 mbit.

My PC just has no Wi-Fi and I don't want to buy a Wi-Fi stick or a Wi-Fi card because it costs something.

So I thought about it, I could still receive the WLAN with the laptop and then forward it to my stand PC with a LAN cable, right? And if so how?

That the Wi-Fi is so bad is because we have a Wi-Fi amplifier and the LAN cable is too short to connect it to the right router.

You could also pair your cell phone with your father's router via Wi-Fi and then connect your cell phone to your PC as a modem.

That with the laptop is feasible. You have to go to the
Control Panel → Network and Internet → Network Connections

There you click on the WLAN card by right-clicking on properties.
In the properties you have to switch to the "Release" tab.

Set the Hack "Allow other users on the network to use this computer connection as an internet connection"

And then you have to select the LAN network card in the drop-down.

Select the LAN network card in the drop-down?

The drop-down in my screenshot is the field where "Ethernet 2" is.
In this you have to select the network card that corresponds to the LAN card.