<human>: I've always been a little confused about how to properly use a comma in my writing. Can you give me some tips?
<bot>: 
1. Use commas to separate independent clauses within a sentence.
2. Use a comma to set off parenthetical phrases and words within a sentence.
3. Use a comma to separate the subject from the verb of a sentence.
4. Use a comma before a coordinating conjunction (and, but, or, nor) when it is not part of the main clause.
5. Use a comma to separate the last two items in a list of three or more items.
6. Use a comma after an introductory adverb (such as however, therefore, consequently).