Asking how much money is to be paid for products or services.

Used to ask the interlocutor how many languages he or she speaks.

Used to ask how many brothers or sisters someone has.

To be knowledgeable about how the world works; to have common sense and judgement.

The tone and delivery of communication is at least as important as what is actually being said.

Alternative form of don't teach your grandmother how to suck eggs

Alternative form of no matter how thin you slice it, it's still baloney

(chiefly US) Regardless of how many clever points or fine distinctions one makes, what one is saying is still false or is still nonsense.

Don't presume to give advice to those who are more experienced.

Alternative form of learn to walk before one can run.