You need a high speed modem and a wifi router. Some high speed modems have wifi capability built into them. If not just take the ethernet cable you would normally feed to your computer to the router and put it in the spot designated for it and then feed an ethernet cable to your computer from the router. Your new router will come with a disk tell you how to do this. When it is connect just follow the disc’s instruction on who to set up a secure wifi access point in your house.