This document discusses several tools for analyzing stocks before investing: - Liquidity ratios like current ratio and acid test ratio indicate a company's ability to meet short-term obligations. An ideal current ratio is 1:1. - P/E ratio shows what investors pay for each rupee of earnings. It should be compared to historical, industry, and market P/E ratios. - Debt-to-equity ratio indicates the amount of debt relative to shareholder equity. It is better for this ratio to be low, but debt can enhance value if returns exceed interest costs. - Operating profit margin shows operational efficiency and pricing power over time compared to industry peers.