Just because we communicate in English doesn’t always mean we use punctuation the same way. Americans use a colon to denote time (4:30) while the British use a period (4.30). Titles such as Mr., Mrs., Ms. and Dr. all receive a period at the end in American English, while British English leaves off the punctuation mark.
And when it comes to single quotes or double quotes, we face the same problem of not being the same. Should you use single quotes or double quotes for dialogue, for quoting inside a quote, for scare quotes?
That depends on which side of the pond you live.