When visiting Canada or the UK, you don’t need to learn a new language, as both countries primarily speak English. However, be aware of some differences in vocabulary, spelling, and pronunciation. For example, Canadians might use terms like "toque" for a winter hat, and the British might refer to "biscuits" instead of "cookies."
Familiarizing yourself with a few regional phrases or cultural nuances can enhance your experience, but overall, speaking American English will be perfectly understandable in both countries.