I always thought that putting the punctuation marks inside the
quotation marks was strange...

I was taught that printers, back in Colonial days, thought that
periods and commas looked "lonely" if outside the quotation marks, so
they began putting them inside for aesthetic reasons.

I don't agree with that rule, so I'm quite likely to intentionally break it in my writing...

If you move to Canada or any part of the former British Empire, you
won't be breaking the rule. Or, you can just break the rule. There
is no penalty, unless you happen to writing to a prospective employer.

vince norris