Either the French Academy (the official one) or for typography, this one that is used as a reference (French National Printing Typography Manual, I don’t know the official translation of the book title):
Or ressources of official websites of public education academies (they follow the Ministry of National Education directives). Like this one.
We try to find official sources like that for French.
We try to avoid blogs or websites not with official references, because we don’t know where the source comes from, or reliability.
But each language could have different rules in typography, punctuation, etc.
That’s why I was wondering what the rule is for English language.
Parentheses ( ) are sometimes used in a body of text to provide further explanation when a word or an expression is difficult to understand. You’ll find them in manuals and guides.
Brackets [ ] are used to offer an explanation to something that you’re quoting. Their use is extremely limited, and personally, I’ve only seen them in history and scientific texts.
Neither requires a space.
e.g. I can’t wait to see my oppa (girls referring to a male friend who is the same age or older).