"First Growth" refers to the initial phase of rapid growth that a young company experiences after establishing its product-market fit. During this stage, businesses often see a significant increase in customer acquisition, revenue, and market presence. This growth is typically fueled by effective marketing strategies, strong customer demand, and sometimes external funding. In the context of startups, achieving "First Growth" is crucial as it sets the foundation for future scaling and sustainability. Companies like Airbnb and Uber are examples of businesses that successfully navigated this phase, leveraging innovative solutions to disrupt traditional markets and attract a large user base quickly.