An Oxford comma is the comma used directly before a coordinating conjunction (usually and, or, or nor). In a sentence, it would look like My mom sent me to the store to buy milk, eggs, and tomatoes. Some people love the Oxford comma, but some people hate it. I don’t think there is anyone who is in between. I think they’re stupid, but you know, that’s just me. All of my college English professors have taught the Oxford comma. It is also sometimes called the serial comma or Harvard comma.
Placing a comma before the word “too” is not necessary. It’s really up to you. I usually do because that’s how I’ve read it in most books and articles, but it won’t mess up the sentence if you don’t.
Brackets can be used inside a quote as a way of clarifying something that could be confusing. Brackets are also used with the expression [sic], which is used when quoting something that has a typo or other error. A prefix or suffix can be placed inside brackets and added to the end of a word. Brackets and the words inside brackets are almost always used for clarification.
