When you're writing a list, use commas between each item in your list. Use and between the last two items, instead of a comma. For example: Today I need to buy milk, bread, apples and potatoes.

I was in Junior Secondary School when my English teacher told me the rule of a comma coming before “and”. For many years, the ...

What is an Oxford comma? We all use commas when writing lists of things. But the Oxford comma has a very special place - it sits BEFORE the conjunction, which is either "and" or "or".