There is information here that is not stated, but it is understood. AT: "I helped you and taught you God's truth for free. Therefore, you should not make other people pay for you to help them or to teach them God's truth" (See: [[rc://en/ta/man/translate/figs-ellipsis]])
These are metals out of which coins were made. This list is a metonym for money, so if the metals are unknown in your area, translate the list as "money." (See: [[rc://en/ta/man/translate/figs-metonymy]])
This means "belts" or "money belts," but it can refer to whatever might be used to carry money. A belt is a long strip of cloth or leather worn around the waist. It was often wide enough that it could be folded and used to carry money.