Your Internet Service provider (ISP) will run a connection to your house. It can be fiber, coaxial cable, or DSL....
DSL uses the phone lines, and you plug a modem into the phone jack,
and a second jack on the modem has an Ethernet port.
Plug a Wireless router into that Ethernet port,
and it broadcasts throughout the house, to all the computers / laptops...
Fiber Optic uses glass fibers, and it is brought up to the house,
where it can be converted to either Coax cable or Ethernet.
From this converter box, it runs to a modem,
usually a modem/router combo, which broadcasts the signal to all computers
Cable is the same as fiber optic, just a different modem or modem/router.
So, no cables to run throughout the house, only the one to the modem or modem/router.
Everything is wireless from there.
I used a wire bakers rack to put my modem/router on, allows air to circulate, keeps it cool.
I put a backup power supply at the bottom, keep equipment from being damaged during power spikes and outages.
I put another on my main computer, a 300 to 450 watt one is more than enough...
http://www.officedepot.com/a/products/383084/APC-Back-UPS-BN450M-Battery-Backup/
For a router, the minimum I would consider is a Linksys EA2700,
Dual band, 2.5 and 5 GHz, and has four gigabit Ethernet ports on the back.
https://www.amazon.com/Linksys-EA2700-Ap...;qid=1501202447