Just general advice about travelling international. It's not as scary as it sounds or some people make it sound. For the travel itself, especially if you will stay in one city, if you can navigate in a big city in your own country, you can do it anywhere else. Use your brain, and don't do things you wouldn't do at home.
Always look into the culture. It's easy to think 'oh it's all Western world, and we speak the same language', but culturally there are differences. Look up some articles or youtube videos like this:
https://dayoutinengland.com/things-americans-are-shocked-by-visit-england/Read into things like hotel room size, firmness of mattresses, portion sizes in restaurants, air conditioning. These things can be very different from what people are used to in the US.
Most important of all: Be open minded
Oh and go into a grocery store, just to look around. I always find it amazing how different grocery stores can be around the world.