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commas are used to separate two or more adjectives.

conjunction
coordinate
compound
unequal

when combining two independent clauses, a comma must be placed

both before and after the conjunction
after the conjunction
before the conjunction
between the two indpendent clauses in place of the conjunction

a comma should not be used to

separate compound elements
set apart an introductory phrase
separate narration from quotations
set apart introductory words or interjections

1. Coordinate adjectives are the adjectives which are placed in sequence with another adjective to describe or to modify a noun. Hence, commas are used to separate two or more coordinate adjectives.

2. When combining two independent clauses, a comma must be placed before the conjunction.

Independent clauses refer to the groups of words which can stand independently and create a meaning. An independent clause has a subject and verb.

For example, I went to the market, but forgot to take money.

In the above independent clause comma is placed before the conjunction 'but'.

3. A comma should not be used to separate compound elements.

Commas are frequently used punctuation in a sentence, hence they are used to create a short pause in a sentence.

Hyphens are used to show a compound sentence and not commas.

because their parents want them to be in the top and get a nice job

explanation:

the speech this question is referring to is president kennedy's special message to the congress on urgent national needs, may 25, 1961

kennedy responds in a very direct and concrete way to those thinking that communism is a positive system:

"yet their aggression is more often concealed than open. they have fired no missiles; and their troops are seldom seen. they send arms, agitators, aid, technicians and propaganda to every troubled area. but where fighting is required, it is usually done by others--by guerrillas striking at night, by assassins striking alone--assassins who have taken the lives of four thousand civil officers in the last twelve months in vietnam alone--by subversives and saboteurs and insurrectionists, who in some cases control whole areas inside of independent nations." (kennedy)

president kennedy presents communism as cowardly, as a hidden and treacherous weapon that strikes from the shadows like thieves, he represents the system as not even being capable of showing and open and overt attack or confrontation. to finish up the response, he expresses that the system attacks even a country's idependence and freedom.