Because in French, most adjectives come after the noun.
So:
Noir is one of the adjectives that normally goes after the noun.
A small group of common adjectives often comes before the noun, but color adjectives like noir, bleu, rouge, etc. usually come after.
French usually shows possession with de rather than with an apostrophe ’s.
So:
This is the normal French structure for possession:
French does not use the English-style possessive apostrophe.
Yes, but the meaning changes slightly.
So:
Both can work, but à côté de is more precise here.
The comma separates the main location from an extra precision.
The sentence first says:
Then it adds:
So the second part gives additional detail about where exactly on or near the binder the stapler is.
In short, the comma helps readability. In everyday writing, some people might omit it, but here it makes the sentence clearer.
A rough pronunciation guide is:
A few useful points: