This document discusses key financial ratios used to evaluate a firm's performance in key areas: liquidity, activity, debt position, and profitability. Liquidity ratios like the current and quick ratios measure a firm's ability to meet short-term obligations. Activity ratios like inventory turnover and accounts receivable measures assess how efficiently a firm converts accounts into sales or cash. Debt ratios like the debt ratio indicate how much debt a firm uses. Profitability ratios like gross profit margin, net profit margin, and return on assets measure what percentage of sales and assets are converted into profits.