The colon comes in handy when you want to provide an example or explanation, to cite a quotation, or to introduce a list. A colon implies that what follows it is related to what precedes it.
One of the most-asked questions I get about grammar rules that relate to the colon is whether to capitalize the first word that follows it. Style guides differ, but The Associated Press Stylebook, my preferred source, suggests: ContinueLike it? Share it!