what do I use to connect my MacBook to my TV

2 ways.

1. Airplay using an Apple Tv,

Use AirPlay to display video from your Mac on an HDTV - Apple Support

or

2. Get an Adapter or cable that can let you plug the MacBook Pro into one of the Tv's inputs. The exact model of your MBP, and available inputs on your Tv will dictate which adapter you need.

https://discussions.apple.com/community/tutorials

Note: If you provide no details, it's hard to give you a detailed response.

• Apart from that, you also need to buy Thunderbolt to HDMI video adapter with audio support and HDMI Cable.
• Find the HDMI Port on Thunderbolt to HDMI adapter.Connect one end of HDMI Cable to it.
• Connect the Thunderbolt end of Thunderbolt to HDMI adapter to Thunderbolt port of your MacBook Air.
• Find the HDMI Port on your TV, and connect other end of HDMI Cable to it.
• All setup is done. Now turn on your TV. Switch the input to the HDMI port. Yeah, the one to which MacBook Air is connected. Done? If everything is done correctly, then you will be able to see the content displayed on your MacBook Pro, on your TV’s screen.

• Apart from that, you also need to buy Thunderbolt to HDMI video adapter with audio support and HDMI Cable.
• Find the HDMI Port on Thunderbolt to HDMI adapter.Connect one end of HDMI Cable to it.
• Connect the Thunderbolt end of Thunderbolt to HDMI adapter to Thunderbolt port of your MacBook Air.
• Find the HDMI Port on your TV, and connect other end of HDMI Cable to it.
• All setup is done. Now turn on your TV. Switch the input to the HDMI port. Yeah, the one to which MacBook Air is connected. Done? If everything is done correctly, then you will be able to see the content displayed on your MacBook Pro, on your TV’s screen.