This question already has an answer here:
I am confused as to when commas are supposed to be used before the conjunction and.
This question answers it but I am still a bit confused.
For instance the following two sentences:
- I am going to buy apples, oranges, and bananas at the store.
- I am going to buy apples, oranges and bananas at the store.
Which of the above sentences is the correct usage of a comma?