Alright, I'm not trying to be rude here, but variables is an extremely basic thing. The MOST basic thing. It's probably the first thing anyone learns in any coding: the (set:) macro (or whatever it is for every other way of programming). I've said this to new twine people SO MANY TIMES! If you're new, and therefore don't know what you're doing, DON'T ASK A QUESTION HERE. If you are new, then you're questions are most likely gonna be basic stuff like this. Please, if you are new, watch youtube videos, read documentations, actually learn how to twine first. If you have a real problem, check if the question has been asked here before (and this kinda question has been asked SO MANY times), and check if it's been asked on the old forum. THEN, when you finally think you understand stuff, and you have a problem, and you've read and watched all kinda stuff, FINALLy ask here. Asking here should be your LAST RESORT. That's what I did. I joined the forum (the old one) ages after I had started doing twine, because I had an issue I could not find an easy answer to.
Also, as Charlie said, please put your format in the title or your tags of the question. If you don't know what that is, look it up.