Explain the rules of comma usage in the following situations: Series of items
Introductory word or phrases
Interrupting phrases
Compound sentences

will give

brainlist

Commas are necessary before a coordinating conjunction (for, and, nor, but, or, yet, so) that separates two independent clauses. Commas are necessary after introductory words, phrases, or clauses in a sentence. Commas are necessary to set off elements that interrupt or add information in a sentence.