You can get adapters to go from HDMI to A/V cables and probably other kinds of adapters to and from other types of input and output.
They should allow you to use your computer and possibly your phone to put things on your TV.
I have a dongle to receive cast from my laptop on my ‘relatively old’ tv. Prolly new tvs have this built in.
Use “connect” from the notifications menu. Win 10 and up methinks.
Am casting President Trump rally now.
Lots of laptops have a HDMI out, thats what Im using now and good for movies playing off a drive as well.
top it off with a blu tooth keyboard as you lounge on your couch. Surfin on the La_Z-Boy!
Because of TV location, I can’t run wires.
I need WiFi type streamer.
Thanks