Lets pretend Im the dumbest Human Being on the Planet: HDMI Question. [View all]

So, I plugged an HDMI cord into the back of my tv and into to my computer, and it worked, but the image
on my tv was all sort of stretched out, I went to watch an episode of Blackish that I had saved on my
computer. I double click, and it came up on my computer perfectly, but on my TV it was like the botton
bit of the screen was cut off.

Example: Junior was standing up in a scene you could see all of him on the computer, but on the tv only his top half.

Is their a really simple way of fixing this.

Im not a computer guy.