Human: I've always wondered how to properly use the Oxford comma in my writing. Can you give me some tips? Assistant: 

1. Use a comma before the conjunction when it is necessary to clarify the meaning of the sentence.
2. Do not use a comma before the conjunction if the two items being connected are both essential components of the same idea or concept.
3. Use a comma after the last item in a series of three or more items that includes a nonessential element.
4. Use a comma before and, or, nor, but, yet, or so in a list of adjectives, phrases, or clauses.
5. Use a comma before the coordinating conjunction (and, or, nor) in a compound sentence.