How can I make online games? I know that sounds dumb, but I don't know how. Is it something like this? Please, I am working really hard on a project that I want to have online support.

P1 x is a cloud variable by the way. This is only for P1 x, but will it work?

A better way would be

This is because cloud variables can only update every 1/10th of a second, and forever loops run 30 times a second, so the X would be higher than the cloud variable.

First off you need two have two scripts. One for sending information, and one for receiving information.
You should have two sprites for these as well. I'd have to show you to explain it though.

(Put your game link here and I'll experiment with it.)

Thanks, but I think i might be able to handle it from here.
Also, a way to receive it is to do this;

This would be for the X on the other sprite, right?

Yes

It's something that can seem very complicated, i recommend searching up for tutorials. You can use max. 10 cloud variables, so using the variable only to store the x position is not efficient. Cloud variables can store up to 255 something numbers, so you could take advantage on that.