This article is part of a 6-part series on DigitalOcean Kubernetes best practices targeted at SMBs and startups. The series covers various aspects of Kubernetes adoption, including scaling, observability, reliability, disaster recovery, security, and more. In this fourth segment, the focus is on scalability, with an emphasis on challenges faced by small to medium-sized businesses (SMBs) and strategies for addressing these challenges. Key points include adhering to well-established practices in Kubernetes and cloud-native computing, utilizing autoscaling mechanisms such as Horizontal Pod Autoscaler (HPA) and Cluster Autoscaler (CA), optimizing application start-up time, scaling DNS at three layers, and implementing network load testing and resilience measures to handle Kubernetes API latency and failures. By following these best practices, SMBs can build Kubernetes environments that effectively handle the demands of their growing business.