What are the 4 types of expenses Dave Ramsey?

Could you please elaborate on the four types of expenses that Dave Ramsey advocates for in his financial advice? I'm curious to know if he categorizes expenses in a specific way that helps individuals prioritize their spending and work towards financial freedom. Are these expenses related to budgeting, debt reduction, savings, or other financial goals? I'm interested in understanding how these categories can guide people towards a healthier financial future.