update the course material
In "Getting started with Microservices with Istio and IBM Cloud Kubernetes Service" course when discussing "codebase" concept for 12 factor apps, it says "Each microservice should have its own project with its own main branch and membership but should all be stored in the same repository." but based on my understanding and snippet from official 12-factor website, this is not the case. Each app/microservice should have its OWN repository and shall NOT share with any other microservices. I think it could be improved by making what codebase means more clear. codebase is not a single repository like the original sentence in the course material said, but rather a set of repositories each responsible for an app.