What are some important phrases I should learn in any foreign language if I'm going to another country?
user
That is a great question!  Here are some useful phrases you should learn in any language you are visiting:

-hello, goodbye, thank you
-excuse me, sorry
-please, thank you (very much)
-where is the bathroom?
-I don't speak ---, do you speak English?
-I would like ---
-I am from ---
-good morning, good evening, good night
-May I have your name?
-What is your email address?
-What is the address here?  (of this place)
-Will you take a photo of me?
-How much does this cost?
-Excuse me, I'm lost, can you help me?
-Are there any hotels nearby?
-What time is it?
-Can you help me find the post office?
-Where is the nearest Starbucks?
-I have a reservation, my name is ---.
-I would like a table for two, please.
-Can I have the menu, please?
-I would like ---.
-May I have the bill please?
-Please send my compliments to the chef.  (in a restaurant)
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assistant
What are some important phrases I should learn in any foreign language if I'm going to another country?
user
That’s a great question! There are a few important phrases that you can learn that are used very often when traveling to other cultures and countries. For example, getting by with a little English and some common phrases will help you get around other countries more easily. Here are a few important phrases that will help you out in different cultures during a trip abroad:

You are welcome. "You are welcome." This phrase will generally be used by people when they say "thank you" in response to a compliment or a gesture you make. For example, if you help someone out on the street, they’ll probably say "thank you" to you in return, and you should respond with "you are welcome".

Hello, how are you? "Hello, how are you?" This is a basic phrase often used as a greeting to say hello to other people. You can use this phrase with locals and when you’re trying to get the attention of the waiter at a restaurant.

See you later. "See you later." This is a phrase that can be used to say goodbye, or you can use it as a note to say, "I’ll see you later." You shouldn’t use this phrase in any formal setting,
assistant
What are some important phrases I should learn in any foreign language if I'm going to another country?