Despite the (valid) criticisms you will see here, you have to start learning somewhere, so an app will have to do. Or some tutorials, there is a bunch on Youtube.
Some 5 years ago Codecademy was the trendy app, Exercism as well. I'm out of the loop these days.
The goal is getting an internship (even unpaid) as quickly as possible. Most real skills are not taught on these courses, or anywhere formally.
Aside of that, once you get through the basic level, start reading threads on Hackernews and lobste.rs. You will understand nothing. And that's good. Try to make sense of it by googling definitions and concepts, that's how you can learn CS theory outside of a uni.
Thank you! I'd love to get an internship, but I'm not sure where to start as a future expat. Any ideas? I plan to immigrate to Europe by getting a degree, which is the only way to citizenship. That's why I'm asking what field would be best to get a degree in, even though people have said a formal education isn't important in IT.