How do you use a comma correctly in a sentence?

To use a comma correctly in a sentence, there are several rules to follow:

1. Use a comma to separate items in a list: For example, "I bought apples, oranges, and bananas."

2. Use a comma before a coordinating conjunction (and, but, or, nor, for, so, yet) when joining two independent clauses: For example, "I went to the store, and I bought some groceries."

3. Use a comma after introductory words or phrases: For example, "However, I still managed to finish the project."

4. Use a comma to set off nonessential information or clauses: For example, "The book, which was written by my favorite author, is a bestseller."

5. Use a comma to separate coordinate adjectives: For example, "She has beautiful, long hair."

6. Use a comma to indicate a pause or to avoid confusion: For example, "Let's eat, Grandma!" (to avoid confusion with "Let's eat Grandma!")

It is important to note that these are general guidelines, and there may be exceptions or additional rules depending on the specific context or style guide being followed.