For consumers, the speed of technological progress is magical, because of what’s suddenly become possible: self-driving cars, same-day delivery, movies and television shows streamed to us anywhere, anytime.

As I described in my previous blog post on the key principles to guide a microservices project, the efficiency of the value chain determines costs, affects profit, and ultimately decides whether a business will reach its goals. It becomes very important to know if the changes we apply to the system—for example, the introduction of a microservice to implement a value-chain step—have positive or negative consequences on the overall system.

In my previous two blog posts, I explored two principles that are at the heart of DevOps: systems thinking and amplifying feedback loops. In this post, we’ll discuss the third and final principle, a culture of experimentation and learning, which is the direct and most compelling effect of the first two principles.

More than a year after the last post of our series regarding the Cloud Native Computing Foundation’s official Kubernetes Certified Administrator program, one might be surprised to see that Kelsey Hightower’s tutorial, Kubernetes the Hard Way, remains one of the main sources to prepare for the exam. But it has earned that distinction. It indeed provides a comprehensive and extensive way of practicing what you will need to know to earn.