How do I use the testfor command?

//ads -- adsterra.com -- native banner
?>
I've been trying to use this command since I found out about it, but for some odd reason, it hasn't been working at all. The command blocks look something like this:
But whenever I go to those certain coordinates, I am not teleported to those coordinates. Am I missing anything?
(Just to clarify: I'm not in a multiplayer game. I'm at singleplayer.)
Pictures about "How do I use the testfor command?"



Quick Answer about "How do I use the testfor command?"
How do you use the Testfor command in Minecraft Education Edition?
The /testfor command became obsolete in Minecraft 1.13, and has been replaced by the /execute command*.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Brett Jordan, Ivan Samkov, Andrea Piacquadio, Andrea Piacquadio