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You might find that there is little merit in using the TV as a monitor unless you sit very close to it - closer than you normally would. That's because at normal viewing distance the TV will look smaller than the laptop screen does on your lap, and so text and fine details will actually be harder to see.
There are different ways to use the TV as a monitor. One is to use a mini display port to HDMI adapter to connect to the TV with an HDMI cable. Another is to use combination wi-fi transmitter and receiver pair, with the transmitter connected to the computer and the receiver connected to the TV. Avoid analog video cables because you won't get the resolution that you'll be wanting.
Decide whether you want to show separate stuff on the laptop screen and the TV at the same time, and decide whether you can handle focusing on the two screens at different distances (something that gets harder with age as your eyes deteriorate).