This document discusses the realities of a career in marketing and provides tips for successful marketing. It notes that marketing often involves analyzing numbers rather than glamorous roles. The most successful marketers 1) enjoy analyzing data, 2) are driven to find answers, and 3) are good at basic math. The key role for marketers is analyzing financial data like profits and losses using simple math. Playing card games helps develop these math and social skills. Following the 80/20 rule by focusing on the top 20% most profitable products can significantly improve a business's profits. The document provides a 3 step process for evaluating business opportunities using basic financial analysis and metrics.