Question: how to use my tv as a second monitor with hdmi?
Answer: Connect an HDMI cable to your laptop If you own a computer that lacks an HDMI port but uses USB-C, such as a MacBook, a USB-C–to–HDMI adapter is a cheap option that will let you connect it to your TV. Combine that with a cheap HDMI cable, and you'll have everything you need to use your TV as a second screen.