Don’t be so boring and stuck-up. I honestly don’t mind saying that people trade currencies on Forex. You buy one while selling another, and that gives you currency pairs. You need a Forex broker, preferably a solid, licensed one. I suggest picking one based on reviews, like here
https://brokersinsider.net/octa-fx/ . I highly recommend this site for finding info and learning about how Forex works. It’s got beginner guides, useful articles, educational stuff. There are also some Forex courses out there, but honestly I’ve only seen a couple that are actually any good.