Common knowledge includes declarations such as february is the shortest month of the year. with common knowledge, we do not need to use quotation marks.

If the statement above asks whether it is true or false. The answer would be true. It is because when you have common knowledge, it is not needed for it to be quoted for it is already common among people and it is already a knowledge of which people knows about without searching or asking about it. Quotation marks are only used when you try to quote or say things that are from the original author, information or who or where it came from and it's not yours. With common knowledge, there is no need to use them for it is already known by a lot of people and are too obvious for it to be asked of.