Techie Talk with Lynn
Dear [Lynn],
Yes, the router also performs the HUB / Switch function. As long as it has enough connections (ports) for all the computers you want on your network, it will function well as a network hub.
Each computer has ONE cable, that connects it to the hub. So if you’ve got both computers accessing the Internet now, it sounds like you have all the network cables you need.
Yes, installing a USB 2 card is actually easier than installing a NIC. No network settings to fool with. USB is quite idiot-proof. 
Yep. Just five years ago. How long ago did YOU think it was? Ten years?
Well, I suppose I respond quickly because I’m not very busy these days. I’m not “rich” anymore, but I love the leisure. I like smiling these days too. Notice?
Tom