Colon With Independent Clause Followed By A List, A Quotation,  Appositive, Or Other Idea Directly Related To The Independent Clause

An independent clause is followed by a colon if the dependent clause is directly related to the independent clause. The dependent clause should clarify or give more information about the independent clause. The beginning of the dependent clause shouldn’t be capitalized unless it begins with a proper noun or an acronym, or it’s a quote which originally began with a capital.

We have everything we need for the baby: diapers, sleepers, toys, bottles and pacifiers.

The teacher spoke firmly to her students: “Please do not throw paper airplanes or spitballs at the back of my head!”

There is a cure for all your ills: chocolate.

Bring something for Grandma: flowers or perfume or the likes.