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. 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?

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?