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The Xiamen dialect of Minnan is taken to be the standard dialect it is similar to and mutually intelligible with Taiwanese, so Xiamen is an excellent starting place to learn Minnan. Minnan is not mutually intelligible with Mandarin, Cantonese or any of the other Min dialects.
Mandarin is almost universally spoken by younger people as it is the only language used in the education system. English is not widely spoken, though staff in higher end hotels will usually be able to communicate in English.
