A: What do you like?
B: I like cooking, my family, and my pets.
Use comma(s) to separate items/things in a list.
• I bought a pound of cheese, a kilo of flour, a gallon of milk, and a pack of cigarette.
• He went out with Michelle, Julie, and me.
When the last comma in a series comes before “and” or “or”, it is known as the Oxford comma. The omission of the Oxford comma can sometimes lead to misunderstandings.
I had eggs, toast and orange juice.
— Omitting a comma before and gives the idea that toast and orange juice represents one dish (you poured the orange juice on top of the toast).
I had eggs, toast, and orange juice.
— Adding a comma after toast makes it clear that the toast and the orange juice are two separate dishes. In cases like this, clarity demands the Oxford comma.
Now, take a look at the picture below.
Put comma(s) where necessary and give explanation what’s the difference in meaning between the first sentence in the picture and the sentence after you put comma(s) in it.