The chapter states, 'A colon should be used after a complete statement in order to introduce one or more directly related ideas, such as a series of directions, a list, or a quotation or other comment illustrating or explaining the statement.'
Class 6 › English Grammar and Composition › Chapter 8: Punctuation & Capitalisation › Topic: Colon usage (introducing related ideas, lists, quotations)
Aligned to the NCTB national curriculum.