Which router to take for a local network?

Question

network hardware

Good afternoon, I want to make myself and my wife a gift for NG, normal wired internet on both computers. Now the Internet goes via cable to the Zyxel Giga II, from there via wi-fi to the apartment + cable to my laptop.
Task: Divide the outgoing cable from Gigi into 2 computers. I would like the device to be set up and forgotten once + without a strong influence on speed. The tariff is 100Mbps, in principle, approximately this speed is. I did not want sagging by more than 10-15%.
Well, actually the question is, which device to take and how to properly configure it?
Thanks in advance!

Answer 1

Task: Divide the outgoing cable from Gigi into 2 computers.