I wired cat5, cable, and phone to every room in my house. It was a waste. Nobody has home phones anymore. Internet is wireless. Cable is a good idea with an amp and splitters. Know your seating arrangement and mount a coax, hdmi, and 120 outlet so you can hang your TV on the walls. Have hdmi outlet down below for accessories.
I also built a movie room in the basement. Well worth it! Plan ahead to run wiring in walls and noise isolation. I did room within a room design.
If you are thinking security system or cameras down the road run the wiring or conduit now.
Garage cement rated to handle lift. Oversized forced air heater or infrared heater(s). Insulated walls and door. Plenty outlets including ceiling for drops. Multiple switches to control lights for low level lighting or high level for car repair at 10 pm at night.
Outdoor motion lights front, side, and rear of house also controlled by switch.
Plan ahead. If down the road you want pool, hottub, outbuilding, etc wire, plumb, etc for it now.
I also wish I had more outdoor outlets on my garage and back porch.