You always want to use wired if possible and use wifi when you can’t use wired.
In your network box in the garage, you would put your network switch in it as well as any coax splitters for your cable tv.
Modems are not routers and you need a router to start the internal network and wifi in your house. It is best to have the network provider supply the modem normally for free and you buy and implement the router and internal network. The best technology to build your network and wifi is to get a 6e mesh network and use the existing wiring in your house to create wired and wireless bridged network all using the same ssid. All your smart home devices will use the 2.4ghz network while all your tablets and phones will use the 5 or 6ghz network.
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