Also called an income statement, your P&L answers one question: are you actually profitable? It covers a period of time, such as a month, quarter or year.
What's on it
Revenue is everything you earned from sales and services. Cost of goods sold is what it directly cost to deliver them. Operating expenses are the costs of running the business: rent, payroll, software, marketing. What's left is your net profit.
What to look for
Compare month to month and year to year. Is revenue growing faster than expenses? Which costs are creeping up? A healthy P&L shows not just profit, but the trend.