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People say Bavaria is the Texas of Germany.
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I never heard of Grünwald before, but my limited and very short research came to the conclusion that it is not very representative of the rest of Germany.
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You greet a Bavarian with “Grüß Gott” (good luck pronouncing that one correctly) or “Servus”.
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Obviously you should try every kind of beer and food you see.
“Gruß” rhymes with “Goose”, yes. But you have to pronounce the Ü in “Grüß”. U and Ü are not the same letter. I cant think of any phonetic example in the english language to explain how to ponounce it.
The second word you can just pronounce like the english word “Got”, yes.