In my country,our teachers teach us that we should use comma "," in many situations. Such as,the situation we mention at least three words in the same part of speech in a sentence. Like the sentence typed below:
My favorite food is hamburger","French fries,and fried chicken.
However,I usually see sentences like the one mentioned below.
The tranquil lack is surrounded by lofty","snow-capped mountains.
The sentence doesn't include at least the three words in the same part of speech,but it have comma before the adjective "snow-capped". So,is the comma used above grammatically correct?