Metrics are numbers that tell you how well something is working. For a marketing funnel, the most important ones are traffic, which tells you how many people are visiting, conversion rate, which shows how many of them take action, cost per lead, and cost per sale. You should also track email open rates and click rates if email is part of your strategy. If any of these numbers drop without a clear reason, something in the funnel needs attention. Tracking all of them together gives you the full picture. Which of these metrics do you think tells the most about funnel health?