Mark Biller, executive editor at Sound Mind Investing, explains how to make investing decisions with two easy questions: "How often should I invest?" and "How much should I invest?" He suggests using the "dollar-cost averaging" formula, which involves investing the same amount of money at regular intervals. This simple framework eliminates guesswork and helps investors buy more shares when stock prices are low and fewer when prices are high. However, it does not protect against losses and should be used as a long-term investment strategy with a minimum of a 5-year investing time horizon. Rob also answers listener questions about taking advantage of credit card rewards, choosing the best bank for a savings account, and paying medical bills in cash.