Get a Raspberry Pi. Newer models have wi-fi. Then you can host all kind of stuff. As long as it is for your own use, you don't need that much computing power. As far as software is concerned, the type of physical connection doesn't matter. Wi-fi stability can be excellent or it can be super frustrating. Depending on your circumstance.
Get one and try it. Learn by doing.
If you can't pull a cable and are dependant on wi-fi, but still want a cable at the end point, buy a wi-fi bridge. You can see it as a switch that you can connect your stuff to with cables, but the connection between the bridge and the router/access point will be wireless, wi-fi.
Your computers won't know they are using a wireless connection.
Alternatively, if you have an extra, unused ethernet interface on a computer that is already connected to the internet, you can share internet through that interface, making your computer a bridge.
This can be accomplished with an android phone and a usb ethernet adapter too. Though you might want a usb hub or split cable for charging.
Should also be easy to acomplish on windows. At least it was on windows 7, when I last used it.