You can learn Rust whenever you want. There's no rule that you must learn anything (including C) before learning Rust. Of course, knowing C will make the basic concepts, especially around memory management, a lot simpler.
If your goal is to eventually learn Rust, your next rabbit hole should be the book ideally. If you prefer a video format, I don't have any specific suggestions since I don't learn through videos usually, but I know there's some good video resources on YouTube.
It can (and does) happen in all countries. For whatever reason though, it seems to be more common in eastern Asia, from what I've seen anyway.
If this bothers you (and it probably should), then you should really check every hotel room you stay in, regardless of country. It usually just takes a few minutes when you get into the room, plus you can check for bed bugs while you're at it.