I have an old laptop that can connect to the internet wirelessly and an old desktop that can’t connect wirelessly. I have an Ethernet cable and I was wondering if I could connect to the internet with the laptop and have an Ethernet cable in it and put the other end of it in the desktop and get internet on the desktop.
You'd need a router program on the laptop to connect the desktop the way you describe. And you'd need to configure it.
So unless you are a computer geek and like to install linux or any windows-server version on your laptop: no, that won't work.
1) You can buy a card with a wireless antenna and plug that into your desktop.
2) You probably have got a box with an antenna somewhere, where the internet 'enters' your home. That antenna box might have an ethernet-plug labelled 'LAN'. If so, you can connect the desktop to the wireless station via that ethernet-cable (if its long enough).
I don't think you can transfer connection from computer to computer, but you should be able to connect the ethernet to the wireless router or modem in one of the ports in the back. Then you would just hook up the desktop like normal. You might need to enter your password for the system (can't remember if that's necessary when it is hard wired), but it should work without a problem.