the weather, because if you spoke about the other two topics with someone it could end badly because people tend to have VERY strong opinions in politics and get very angry when someone doesn't agree with them. It is also rude to discuss your personal income with someone other than imediate family(spouse/parents) and financial advisers.
In an essay, article, or book, an introduction (also known as a prolegomenon) is a beginning section which states the purpose and goals of the following writing. ... The introduction typically describes the scope of the document and gives the brief explanation or summary of the document.C introduction