To ensure your marketing efforts are effective, you must regularly measure and analyze their performance. Key metrics to track include: 1. Customer Acquisition Cost (CAC): The cost of acquiring a new customer. 2. Customer Lifetime Value (CLV): The total revenue a business can expect from a single customer over their lifetime. 3. Conversion Rate: The percentage of visitors who take a desired action, such as making a purchase or signing up for a newsletter. 4. Return on Investment (ROI): The profitability of your marketing activities.