If any of the languages you know is spoken in more than one region (ex: European vs Brazilian Portuguese), what version of the language do you speak?

You will speak the version that you learned. You will mostly notice regional differences in the idioms and synonyms of the words you know might be used more commonly in one region vs the other.

For example, in London you might hear people use boot instead of trunk.

But the majority of the words will be the same regardless of region.