[Rickl]

Depending on how your house is wired you will have some fun trying to figure out what happened on the inside. Most builders will provide "as built" drawings showing locations for everything in the house.

Cable tv sourced internet from spectrum or comcast will require a cable modem. They have at least one port to plug in a network cable.

Telephone company internet (dsl) requires a dsl modem and it to will have network ports.

A lot of manufacturers build in wifi at either 2.4 or 5g connection. Wifi works better at elevation. If frequent or low signal is an issue addition of extenders may be needed.

Each type of system has commonalities. Higher the better, power and input for your system. After working on an older house issues like adding cable splitters becomes a significant problem. A 2 dollar splitter may work for your TV but may not have the characteristics to allow transmission of a signal. Cable companies may just say we see your modem, therefore you have service.

Safety first, grounding of your wiring and boxes. ( you will lose them if a lightening strike is close or hits wires you may not even notice)

The most direct connection with.the least signal degradation from your provider. (Preferably none or one splitter)
Height ( which doesnt trump your safety)
Reduction interference caused by your devices or others. Most household wireless devices run.at the 2.4 frequency. There are ways to minimize.
Your computer. Just because you order the highest speed doesnt mean speed check is going to show it.

Computers, networks and associated issues are not uncommon and require care and feeding as your house ages. If it didnt you wouldnt have networking engineer out there.

Cheers!